{"kind": "plan", "major": "18", "item": {"slug": "foreign-scan", "name": "Foreign Scan", "name_zh": "ForeignScan", "category": "Extensibility", "summary": "Delegates a foreign scan or supported direct modification to the foreign-data wrapper.", "aliases": ["Foreign Delete", "Foreign Insert", "Foreign Scan", "Foreign Update", "ForeignScan", "T_ForeignScan"], "content_hash": "e8a00b1256b63b1dbb9ad615be10919cbcedb8e05e607c6892c146112d2d2ab7", "versions": {"10": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"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/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "53742e61efefc4c3b7d5fbc1e46dff49aa0e6b5e4425f7472d7cd4d567b88ba4", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 980, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:980", "sha256": "a785298532047cfeda969e78c3597a343dc1c56d61ba85830b0f16a02a14b5a1", "archive_sha256": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9"}, {"url": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "line": 277, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:277", "sha256": "cea76648bb38ae55f18f989768bee1a4ee025691ceea0f86bccb29dcdc166acc", "archive_sha256": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9"}, {"url": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "53742e61efefc4c3b7d5fbc1e46dff49aa0e6b5e4425f7472d7cd4d567b88ba4", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "If any system columns are requested, we have to force the tuple into physical-tuple form to avoid \"cannot extract system attribute from virtual tuple\" errors later. We also insert a valid value for tableoid, which is the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual", "If an outer join is pushed down, RecheckForeignScan may need to store a different tuple in the slot, because a different set of columns may go to NULL upon recheck. Otherwise, it shouldn't need to change the slot contents, just return true or false to indicate whether the quals still pass. For simple cases, setting fdw_recheck_quals may be easier than providing this callback."]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "11": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"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/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "bf16c61a5cf45f9f65546a2e4f2db8857c9d3ee3b04fe3bb87a6c7b4079f6d8c", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1105, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1105", "sha256": "9df8400c1a4377179572ceb916d6020fca4e2760f74bf416d77ed97476523bbd", "archive_sha256": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0"}, {"url": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "line": 277, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:277", "sha256": "95ef4d4a5df4c29f14af9763fae2c530449bdacdf3853d9ff297adf1fed6153b", "archive_sha256": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0"}, {"url": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "bf16c61a5cf45f9f65546a2e4f2db8857c9d3ee3b04fe3bb87a6c7b4079f6d8c", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "If any system columns are requested, we have to force the tuple into physical-tuple form to avoid \"cannot extract system attribute from virtual tuple\" errors later. We also insert a valid value for tableoid, which is the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual", "If an outer join is pushed down, RecheckForeignScan may need to store a different tuple in the slot, because a different set of columns may go to NULL upon recheck. Otherwise, it shouldn't need to change the slot contents, just return true or false to indicate whether the quals still pass. For simple cases, setting fdw_recheck_quals may be easier than providing this callback."]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "12": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"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/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "3888ba0d1df69d9289ac9cf2a6bf26a32f9a03aeee467835610d2d43cda936d1", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1176, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1176", "sha256": "d02ea84fdaa201de5d9360645a9f24bfbd2c31f7d45a639e09560ac0e6b6471d", "archive_sha256": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}, {"url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "line": 277, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:277", "sha256": "311b17379fe54e3f342fe5ad41c43afbdfa1b844978db2bb2eb22b82520d3256", "archive_sha256": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}, {"url": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "3888ba0d1df69d9289ac9cf2a6bf26a32f9a03aeee467835610d2d43cda936d1", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "Insert valid value into tableoid, the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual", "If an outer join is pushed down, RecheckForeignScan may need to store a different tuple in the slot, because a different set of columns may go to NULL upon recheck. Otherwise, it shouldn't need to change the slot contents, just return true or false to indicate whether the quals still pass. For simple cases, setting fdw_recheck_quals may be easier than providing this callback."]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "13": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"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/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "b600305fcd56784f62ef7ed1ae3cc6ccda5784b35e2883c19951a575f32639ac", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1234, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1234", "sha256": "541713e0e7f1c9cc352c2b6028964d440c19d2678a4463000094c24a88c1e730", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "line": 277, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:277", "sha256": "d085ee99acfa00587e6ade3a1d9f8108a0566beedbbee3f54a50c9fc0cc2e875", "archive_sha256": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, {"url": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "b600305fcd56784f62ef7ed1ae3cc6ccda5784b35e2883c19951a575f32639ac", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "Insert valid value into tableoid, the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual", "If an outer join is pushed down, RecheckForeignScan may need to store a different tuple in the slot, because a different set of columns may go to NULL upon recheck. Otherwise, it shouldn't need to change the slot contents, just return true or false to indicate whether the quals still pass. For simple cases, setting fdw_recheck_quals may be easier than providing this callback."]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "explain_prefixes": ["Parallel"], "runtime_verified": false, "source_inventory": {"explain": "src/backend/commands/explain.c", "executor": "src/backend/executor/execProcnode.c", "implementation": "src/backend/executor/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "14": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"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/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "d869579fdc907dac8107565adc47fbf55f819c6767eaceed285bd84e776b02ec", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1273, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1273", "sha256": "e091be4e2a083b8dea39ccd09beedede22c1716ef974da66c214a44f48be8c41", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "line": 284, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:284", "sha256": "72da1c5ad457f1d92a39ab73531701794df858419e3b89d6e6cb7079634e68fa", "archive_sha256": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, {"url": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "d869579fdc907dac8107565adc47fbf55f819c6767eaceed285bd84e776b02ec", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "direct modifications cannot be re-evaluated, so shouldn't get here during EvalPlanQual processing", "Insert valid value into tableoid, the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual"]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "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/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "15": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"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/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "5d91d0cdb4a086586b49597f2d90172a445e60b1e275a69444c09c83578e256e", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1276, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1276", "sha256": "bb3b442d0f1b098aa8707335250102f027a596cd94117308bd16d1d36b258f5c", "archive_sha256": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, {"url": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "line": 284, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:284", "sha256": "19836c50a272741a4eac653541e655437c2e00710a541e5348d6a277d0669d7c", "archive_sha256": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, {"url": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "5d91d0cdb4a086586b49597f2d90172a445e60b1e275a69444c09c83578e256e", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "direct modifications cannot be re-evaluated, so shouldn't get here during EvalPlanQual processing", "Insert valid value into tableoid, the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual"]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "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/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "16": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"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/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "85f79eb7081402f3971427a13bc3990e353db5d0002c8bc7535421aa3aa8f572", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1309, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1309", "sha256": "8e017f0116dbea471339b40c37a667cc9f95039e7e0329c783e5e8ce194de7e1", "archive_sha256": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, {"url": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "line": 284, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:284", "sha256": "e48c08e555f8cb4e4bb43df516c4b8906ce9bc374b2a745d98a1fc8c22cc5099", "archive_sha256": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, {"url": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "85f79eb7081402f3971427a13bc3990e353db5d0002c8bc7535421aa3aa8f572", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "direct modifications cannot be re-evaluated, so shouldn't get here during EvalPlanQual processing", "Insert valid value into tableoid, the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual"]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "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/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "17": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"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/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "fa84b156660f0b96aede585ba6b06809195ad0185d00b8a5cde1aa397ee47f27", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1498, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1498", "sha256": "741251b1a3b6d269a52a673d42eb63b02e13a5872db7b359b137086ab21b63c8", "archive_sha256": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, {"url": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "line": 284, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:284", "sha256": "a77576e158b94cb01fa8c5174ba133004eabdd727660323f8afc66c8d2e757b8", "archive_sha256": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, {"url": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "fa84b156660f0b96aede585ba6b06809195ad0185d00b8a5cde1aa397ee47f27", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "direct modifications cannot be re-evaluated, so shouldn't get here during EvalPlanQual processing", "Insert valid value into tableoid, the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual"]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "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/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "18": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"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/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "37b85b68b6fc26d94e40d9173dbfed8b69c70877c54ee72ffc761e2f7b876a0c", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1483, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1483", "sha256": "34c86d6070224a0e981efef51f79101d6d505e5874f1684ace183034bab14bb4", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "line": 284, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:284", "sha256": "f8a06a3f539077249b20664b2812433db6d7bd12b2c0ca633525db43d06f112a", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "37b85b68b6fc26d94e40d9173dbfed8b69c70877c54ee72ffc761e2f7b876a0c", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "direct modifications cannot be re-evaluated, so shouldn't get here during EvalPlanQual processing", "Insert valid value into tableoid, the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual"]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "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/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "19": {"facts": [{"label": "Core node tag", "value": "T_ForeignScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Foreign Scan"}, {"label": "Inputs", "value": "Foreign-data wrapper plan and callbacks"}, {"label": "Output", "value": "Provider-defined scan or RETURNING tuples"}, {"label": "Executor initializer", "value": "ExecInitForeignScan"}, {"label": "Memory mechanism", "value": "unclassified"}], "memory": {"evidence": [{"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "9a5a783cffac51164e5928f61330fc3710d6c122a6036cb4708f6bce8da73ab9", "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": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1495, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1495", "sha256": "8b115b1c194a4b54ae630209a741e293b1df49a9052f10b2de9ca092a48998e3", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "line": 284, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:284", "sha256": "5e39b2037bed672da55104229ecc32da5abde44c26bcad01479edcfa044d09ed", "archive_sha256": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, {"url": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "9a5a783cffac51164e5928f61330fc3710d6c122a6036cb4708f6bce8da73ab9", "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_ForeignScan", "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: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. 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Inspect the same-build implementation and its expressions or provider.", "source_notes": []}, "tables": [{"key": "explain-labels", "rows": [{"label": "Foreign Scan", "identity": "Foreign Scan"}, {"label": "Foreign Insert", "identity": "Foreign Scan"}, {"label": "Foreign Update", "identity": "Foreign Scan"}, {"label": "Foreign Delete", "identity": "Foreign 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": 1495, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1495", "sha256": "13402758013520451539427b5993db06d463ca11c4e2d4cc5444e82367688077", "archive_sha256": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41"}, {"url": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "line": 284, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:284", "sha256": "5e39b2037bed672da55104229ecc32da5abde44c26bcad01479edcfa044d09ed", "archive_sha256": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41"}, {"url": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "path": "src/backend/executor/nodeForeignscan.c", "label": "src/backend/executor/nodeForeignscan.c", "sha256": "9a5a783cffac51164e5928f61330fc3710d6c122a6036cb4708f6bce8da73ab9", "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_ForeignScan", "sections": [{"title": "EXPLAIN names and attributes", "paragraphs": ["Structured formats use the Node Type above. 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Text-format spellings can also include operation, strategy, join type, scan direction or aggregation-stage attributes.", "Text names recorded by this source: Foreign Scan, Foreign Insert, Foreign Update, Foreign Delete.", "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: ExecForeignScanEstimate, ExecForeignScanInitializeDSM, ExecForeignScanInitializeWorker, ExecForeignScanReInitializeDSM."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeForeignscan.c Routines to support scans of foreign tables", "ExecForeignScan scans a foreign table. ExecInitForeignScan creates and initializes state info. ExecReScanForeignScan rescans the foreign relation. ExecEndForeignScan releases any resources allocated.", "direct modifications cannot be re-evaluated, so shouldn't get here during EvalPlanQual processing", "Insert valid value into tableoid, the only actually-useful system column.", "ForeignRecheck -- access method routine to recheck a tuple in EvalPlanQual"]}, {"code": "case T_ForeignScan:\n\t\t\tsname = \"Foreign Scan\";\n\t\t\tswitch (((ForeignScan *) plan)->operation)\n\t\t\t{\n\t\t\t\tcase CMD_SELECT:\n\t\t\t\t\tpname = \"Foreign Scan\";\n\t\t\t\t\toperation = \"Select\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_INSERT:\n\t\t\t\t\tpname = \"Foreign Insert\";\n\t\t\t\t\toperation = \"Insert\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_UPDATE:\n\t\t\t\t\tpname = \"Foreign Update\";\n\t\t\t\t\toperation = \"Update\";\n\t\t\t\t\tbreak;\n\t\t\t\tcase CMD_DELETE:\n\t\t\t\t\tpname = \"Foreign Delete\";\n\t\t\t\t\toperation = \"Delete\";\n\t\t\t\t\tbreak;\n\t\t\t\tdefault:\n\t\t\t\t\tpname = \"???\";\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Delegates a foreign scan or supported direct modification to the foreign-data wrapper."], "evidence_kind": "source and documentation", "explain_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "partial_modes": [], "comparison_data": {"node_tag": "T_ForeignScan", "strategies": [], "text_names": ["Foreign Scan", "Foreign Insert", "Foreign Update", "Foreign Delete"], "initializer": "ExecInitForeignScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison_hash": "1c2fce5096a585774ac71065ed48f534475dbb94feb6a37eb58f5b2ea8f25ac5", "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/nodeForeignscan.c"}, "parallel_callbacks": ["ExecForeignScanEstimate", "ExecForeignScanInitializeDSM", "ExecForeignScanInitializeWorker", "ExecForeignScanReInitializeDSM"]}, "comparison": {"left": "17", "right": "18", "status": "unchanged", "diff": ""}}