{"kind": "plan", "major": "18", "item": {"slug": "custom-scan", "name": "Custom Scan", "name_zh": "CustomScan", "category": "Extensibility", "summary": "Executes a plan supplied by a custom-scan provider.", "aliases": ["Custom Scan (%s)", "CustomScan", "T_CustomScan"], "content_hash": "e42bb000e6ab1d49611da52634bee780e2ced0da09b8479c26e1e7fa5ac1ee0a", "versions": {"10": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "8bff0b235093500fbdf848e29c05e40506abe5e45b5e924cfb11db936841829f", "archive_sha256": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=10", "label": "EXPLAIN"}, {"url": "/docs/10/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/10/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 10.23 source archive", "label": "10.23", "major": "10", "channel": "historical", "revision": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9", "source_url": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "line": 1005, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1005", "sha256": "a785298532047cfeda969e78c3597a343dc1c56d61ba85830b0f16a02a14b5a1", "archive_sha256": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9"}, {"url": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "line": 282, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:282", "sha256": "cea76648bb38ae55f18f989768bee1a4ee025691ceea0f86bccb29dcdc166acc", "archive_sha256": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9"}, {"url": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "8bff0b235093500fbdf848e29c05e40506abe5e45b5e924cfb11db936841829f", "archive_sha256": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9"}, {"url": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "d562c321108844798cd234303fffb618f13d4ee3f3a5ac79bfd963b077e47c22", "archive_sha256": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "open the base relation, if any, and acquire an appropriate lock on it", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "11": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "c1ff93e80239f360e9346f146778909edad35a2084d809a5d728e0a60206a645", "archive_sha256": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=11", "label": "EXPLAIN"}, {"url": "/docs/11/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/11/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 11.22 source archive", "label": "11.22", "major": "11", "channel": "historical", "revision": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0", "source_url": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "line": 1130, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1130", "sha256": "9df8400c1a4377179572ceb916d6020fca4e2760f74bf416d77ed97476523bbd", "archive_sha256": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0"}, {"url": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "line": 282, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:282", "sha256": "95ef4d4a5df4c29f14af9763fae2c530449bdacdf3853d9ff297adf1fed6153b", "archive_sha256": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0"}, {"url": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "c1ff93e80239f360e9346f146778909edad35a2084d809a5d728e0a60206a645", "archive_sha256": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0"}, {"url": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "5e0511194183800e8d6eb293fd4b40639c7d3118e2d199c8e7865ba4fa4cf67f", "archive_sha256": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "open the base relation, if any, and acquire an appropriate lock on it", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "12": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "11e5d4f6fa1448ea8337ffd89c05cdddb1c97864d0487eb4a5f57213d15a5a4d", "archive_sha256": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=12", "label": "EXPLAIN"}, {"url": "/docs/12/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/12/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 12.22 source archive", "label": "12.22", "major": "12", "channel": "historical", "revision": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b", "source_url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "line": 1201, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1201", "sha256": "d02ea84fdaa201de5d9360645a9f24bfbd2c31f7d45a639e09560ac0e6b6471d", "archive_sha256": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}, {"url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "line": 282, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:282", "sha256": "311b17379fe54e3f342fe5ad41c43afbdfa1b844978db2bb2eb22b82520d3256", "archive_sha256": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}, {"url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "11e5d4f6fa1448ea8337ffd89c05cdddb1c97864d0487eb4a5f57213d15a5a4d", "archive_sha256": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}, {"url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "b0c4a0aeb48660ce06e5e700d5529ca9066fd16682bd15783d6e71b5420b07b0", "archive_sha256": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "13": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "dfd00332b687df2770c0e85648d9ead66af89a48c9cc30830b6ac73e27196602", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=13", "label": "EXPLAIN"}, {"url": "/docs/13/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/13/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 13.23 source archive", "label": "13.23", "major": "13", "channel": "historical", "revision": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6", "source_url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "line": 1259, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1259", "sha256": "541713e0e7f1c9cc352c2b6028964d440c19d2678a4463000094c24a88c1e730", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "line": 282, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:282", "sha256": "d085ee99acfa00587e6ade3a1d9f8108a0566beedbbee3f54a50c9fc0cc2e875", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "dfd00332b687df2770c0e85648d9ead66af89a48c9cc30830b6ac73e27196602", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "dcb296833777b02008c4b6bae8e8f7c6423b7ffba21f36702597c9d596d039ab", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "14": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "87081dfab21e068c319cb66880ec680a20f96930fd94f59106cc3d6a647931e7", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=14", "label": "EXPLAIN"}, {"url": "/docs/14/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/14/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 14.24 source archive", "label": "14.24", "major": "14", "channel": "stable", "revision": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897", "source_url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "line": 1298, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1298", "sha256": "e091be4e2a083b8dea39ccd09beedede22c1716ef974da66c214a44f48be8c41", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "line": 289, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:289", "sha256": "72da1c5ad457f1d92a39ab73531701794df858419e3b89d6e6cb7079634e68fa", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "87081dfab21e068c319cb66880ec680a20f96930fd94f59106cc3d6a647931e7", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "302f51a16b570dba7ec4e7bc045f7df5800d21630280354d1a24025f3baec75d", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel", "Async"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "15": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "0276e87b4b21a5e4e0d69d1b78339db86978de62fc2d21d450c5de8ac361e285", "archive_sha256": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=15", "label": "EXPLAIN"}, {"url": "/docs/15/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/15/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 15.19 source archive", "label": "15.19", "major": "15", "channel": "stable", "revision": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89", "source_url": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "line": 1301, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1301", "sha256": "bb3b442d0f1b098aa8707335250102f027a596cd94117308bd16d1d36b258f5c", "archive_sha256": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, {"url": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "line": 289, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:289", "sha256": "19836c50a272741a4eac653541e655437c2e00710a541e5348d6a277d0669d7c", "archive_sha256": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, {"url": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "0276e87b4b21a5e4e0d69d1b78339db86978de62fc2d21d450c5de8ac361e285", "archive_sha256": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, {"url": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "fb4a4c8165495299131173680bc02a950d88e1ff610231fd97997bc0c9afc1d7", "archive_sha256": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel", "Async"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "16": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "6baff2c85041e5a755b5fdb8f8026f4f41bfae92e4f8b932ec2e5a853736405f", "archive_sha256": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=16", "label": "EXPLAIN"}, {"url": "/docs/16/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/16/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 16.15 source archive", "label": "16.15", "major": "16", "channel": "stable", "revision": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed", "source_url": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "line": 1334, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1334", "sha256": "8e017f0116dbea471339b40c37a667cc9f95039e7e0329c783e5e8ce194de7e1", "archive_sha256": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, {"url": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "line": 289, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:289", "sha256": "e48c08e555f8cb4e4bb43df516c4b8906ce9bc374b2a745d98a1fc8c22cc5099", "archive_sha256": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, {"url": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "6baff2c85041e5a755b5fdb8f8026f4f41bfae92e4f8b932ec2e5a853736405f", "archive_sha256": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, {"url": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "97db47353db76326b874589a5ad0a04501cc74cd72e237e7bd956e7472c41f1f", "archive_sha256": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Use a custom slot if specified in CustomScanState or use virtual slot otherwise.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel", "Async"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "17": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "3a0b348efe78c7a0f4ca785f235b244b2d6a54989ed9892742d74e4548e327a9", "archive_sha256": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=17", "label": "EXPLAIN"}, {"url": "/docs/17/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/17/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 17.11 source archive", "label": "17.11", "major": "17", "channel": "stable", "revision": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979", "source_url": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "line": 1523, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1523", "sha256": "741251b1a3b6d269a52a673d42eb63b02e13a5872db7b359b137086ab21b63c8", "archive_sha256": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, {"url": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "line": 289, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:289", "sha256": "a77576e158b94cb01fa8c5174ba133004eabdd727660323f8afc66c8d2e757b8", "archive_sha256": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, {"url": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "3a0b348efe78c7a0f4ca785f235b244b2d6a54989ed9892742d74e4548e327a9", "archive_sha256": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, {"url": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "d390dd69e2d3f5085beb42b33e46ff0676a2959b916a12b82118a7e545f8e562", "archive_sha256": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Use a custom slot if specified in CustomScanState or use virtual slot otherwise.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel", "Async"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "18": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "8827a109e7111830daadc159c1f37519f8856040c3bd194f8055b379f7c34dff", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=18", "label": "EXPLAIN"}, {"url": "/docs/18/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/18/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 18.6 source archive", "label": "18.6", "major": "18", "channel": "stable", "revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f", "source_url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "line": 1508, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1508", "sha256": "34c86d6070224a0e981efef51f79101d6d505e5874f1684ace183034bab14bb4", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "line": 289, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:289", "sha256": "f8a06a3f539077249b20664b2812433db6d7bd12b2c0ca633525db43d06f112a", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "8827a109e7111830daadc159c1f37519f8856040c3bd194f8055b379f7c34dff", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "52422b327a8049fbbb20d8b96008a0fc0a6fafa60f7eff3c695d5b2e83830120", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Use a custom slot if specified in CustomScanState or use virtual slot otherwise.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel", "Async"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "19": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "14e15c695c41a8f5c6ccef43295b6626abf5718609e1204c3662c85064016dae", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=19", "label": "EXPLAIN"}, {"url": "/docs/19/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/19/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 19beta4 source archive", "label": "19beta4", "major": "19", "channel": "preview", "revision": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86", "source_url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "line": 1520, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1520", "sha256": "8b115b1c194a4b54ae630209a741e293b1df49a9052f10b2de9ca092a48998e3", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "line": 289, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:289", "sha256": "5e39b2037bed672da55104229ecc32da5abde44c26bcad01479edcfa044d09ed", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "14e15c695c41a8f5c6ccef43295b6626abf5718609e1204c3662c85064016dae", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "1c65d5d6b6c81c71531685843647869bcae630779d815a5036b06e070c6c06c7", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Use a custom slot if specified in CustomScanState or use virtual slot otherwise.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel", "Async"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "20": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "14e15c695c41a8f5c6ccef43295b6626abf5718609e1204c3662c85064016dae", "archive_sha256": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=20", "label": "EXPLAIN"}, {"url": "/docs/devel/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/devel/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 20devel source archive", "label": "20devel", "major": "20", "channel": "devel", "revision": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41", "source_url": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "source_snapshot_utc": "26-Sep-2026 20:22"}, "sources": [{"url": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "line": 1520, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1520", "sha256": "13402758013520451539427b5993db06d463ca11c4e2d4cc5444e82367688077", "archive_sha256": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41"}, {"url": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "line": 289, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:289", "sha256": "5e39b2037bed672da55104229ecc32da5abde44c26bcad01479edcfa044d09ed", "archive_sha256": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41"}, {"url": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "14e15c695c41a8f5c6ccef43295b6626abf5718609e1204c3662c85064016dae", "archive_sha256": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41"}, {"url": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "7a94ed1652f0d74d50c39971d1cd3e8051dbc0d6058f31b6de71a433ca343521", "archive_sha256": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Use a custom slot if specified in CustomScanState or use virtual slot otherwise.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel", "Async"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}}}, "snapshot": {"facts": [{"label": "Core node tag", "value": "T_CustomScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Custom Scan"}, {"label": "Inputs", "value": "Provider-defined plan, possibly with children"}, {"label": "Output", "value": "Provider-defined tuples"}, {"label": "Executor initializer", "value": "ExecInitCustomScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "8827a109e7111830daadc159c1f37519f8856040c3bd194f8055b379f7c34dff", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}], "mechanism": "unclassified", "description": "This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Custom Scan (%s)", "identity": "Custom Scan"}], "title": "EXPLAIN labels in this source build", "columns": [{"key": "label", "label": "Text-format label"}, {"key": "identity", "label": "Structured node identity"}]}], "related": [{"url": "/wiki/sql/explain/?v=18", "label": "EXPLAIN"}, {"url": "/docs/18/using-explain.html", "label": "Using EXPLAIN"}, {"url": "/docs/18/parallel-plans.html", "label": "Parallel plans"}], "release": {"ref": "PostgreSQL 18.6 source archive", "label": "18.6", "major": "18", "channel": "stable", "revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f", "source_url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "source_snapshot_utc": ""}, "sources": [{"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "line": 1508, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1508", "sha256": "34c86d6070224a0e981efef51f79101d6d505e5874f1684ace183034bab14bb4", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "line": 289, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:289", "sha256": "f8a06a3f539077249b20664b2812433db6d7bd12b2c0ca633525db43d06f112a", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/executor/nodeCustom.c", "label": "src/backend/executor/nodeCustom.c", "sha256": "8827a109e7111830daadc159c1f37519f8856040c3bd194f8055b379f7c34dff", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/include/nodes/plannodes.h", "label": "src/include/nodes/plannodes.h", "sha256": "52422b327a8049fbbb20d8b96008a0fc0a6fafa60f7eff3c695d5b2e83830120", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}], "node_tag": "T_CustomScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Custom Scan (%s).", "Parallel-aware and parallel-safe are different plan properties. A node running inside a parallel worker is not necessarily a parallel-aware node."]}, {"title": "Memory and temporary storage", "paragraphs": ["This extraction does not assign a universal memory limit or spill policy to this node. Inspect the same-build implementation and its expressions or provider."]}, {"title": "Parallel execution and instrumentation", "paragraphs": ["The source callbacks below can coordinate execution or collect worker instrumentation. Their presence is not a blanket claim that this node supports a shared parallel scan or shared state.", "Callbacks in this build: ExecCustomScanEstimate, ExecCustomScanInitializeDSM, ExecCustomScanInitializeWorker, ExecCustomScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeCustom.c Routines to handle execution of custom scan node", "Allocate the CustomScanState object. We let the custom scan provider do the palloc, in case it wants to make a larger object that embeds CustomScanState as the first field. It must set the node tag and the methods field correctly at this time. Other standard fields should be set to zero.", "Use a custom slot if specified in CustomScanState or use virtual slot otherwise.", "Determine the scan tuple type. If the custom scan provider provided a targetlist describing the scan tuples, use that; else use base relation's rowtype.", "The callback of custom-scan provider applies the final initialization of the custom-scan-state node according to its logic."]}, {"code": "case T_CustomScan:\n\t\t\tsname = \"Custom Scan\";\n\t\t\tcustom_name = ((CustomScan *) plan)->methods->CustomName;\n\t\t\tif (custom_name)\n\t\t\t\tpname = psprintf(\"Custom Scan (%s)\", custom_name);\n\t\t\telse\n\t\t\t\tpname = sname;\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Executes a plan supplied by a custom-scan provider."], "evidence_kind": "source and documentation", "explain_names": ["Custom Scan (%s)"], "partial_modes": [], "comparison_data": {"node_tag": "T_CustomScan", "strategies": [], "text_names": ["Custom Scan (%s)"], "initializer": "ExecInitCustomScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison_hash": "c905b2ddadbea858aa4811fa7d15ee0733e3c82e2ac2c9fad827846072b5c975", "explain_prefixes": ["Parallel", "Async"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeCustom.c"}, "parallel_callbacks": ["ExecCustomScanEstimate", "ExecCustomScanInitializeDSM", "ExecCustomScanInitializeWorker", "ExecCustomScanReInitializeDSM"]}, "comparison": {"left": "17", "right": "18", "status": "unchanged", "diff": ""}}