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This is a tad unusual, but we want to delete the eval state again when we move to the next row, to avoid growth of memory requirements over a long values list. For rows in which that won't work, we already built the eval state at plan startup.", "Pass parent as NULL, not my plan node, because we don't want anything in this transient state linking into permanent state. The only expression type that might wish to do so is a SubPlan, and we already checked that there aren't any."]}, {"code": "case T_ValuesScan:\n\t\t\tpname = sname = \"Values Scan\";\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Evaluates and scans a VALUES row list."], "evidence_kind": "source and documentation", "explain_names": ["Values Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_ValuesScan", "strategies": [], "text_names": ["Values Scan"], "initializer": "ExecInitValuesScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": []}, "comparison_hash": "a0f7ecd83c2ff3883a8f6be3d13bd28e040a53da79545a3140489e6b4a0e75e8", "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/nodeValuesscan.c"}, "parallel_callbacks": []}}}, "snapshot": {"facts": [{"label": "Core node tag", "value": "T_ValuesScan"}, {"label": "Structured EXPLAIN Node Type", "value": "Values Scan"}, {"label": "Inputs", "value": "A list of row expressions"}, {"label": "Output", "value": "VALUES tuples"}, {"label": "Executor initializer", "value": "ExecInitValuesScan"}, {"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/nodeValuesscan.c", "label": "src/backend/executor/nodeValuesscan.c", "sha256": "2cbd81c45f271df78a8ff17890449ff527f2b49b29187b6d61767f321165b2a3", "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": "Values Scan", "identity": "Values 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": 1471, "path": "src/backend/commands/explain.c", "label": "src/backend/commands/explain.c:1471", "sha256": "34c86d6070224a0e981efef51f79101d6d505e5874f1684ace183034bab14bb4", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "line": 264, "path": "src/backend/executor/execProcnode.c", "label": "src/backend/executor/execProcnode.c:264", "sha256": "f8a06a3f539077249b20664b2812433db6d7bd12b2c0ca633525db43d06f112a", "archive_sha256": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, {"url": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "path": "src/backend/executor/nodeValuesscan.c", "label": "src/backend/executor/nodeValuesscan.c", "sha256": "2cbd81c45f271df78a8ff17890449ff527f2b49b29187b6d61767f321165b2a3", "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_ValuesScan", "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: Values Scan.", "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: none extracted from this node implementation."]}, {"title": "Executor implementation notes", "paragraphs": ["nodeValuesscan.c Support routines for scanning Values lists (\"VALUES (...), (...), ...\" in rangetable).", "Always clear the result slot; this is appropriate if we are at the end of the data, and if we're not, we still need it as the first step of the store-virtual-tuple protocol. It seems wise to clear the slot before we reset the context it might have pointers into.", "Get rid of any prior cycle's leftovers. We use ReScanExprContext not just ResetExprContext because we want any registered shutdown callbacks to be called.", "Unless we already made the expression eval state for this row, build it in the econtext's per-tuple memory. This is a tad unusual, but we want to delete the eval state again when we move to the next row, to avoid growth of memory requirements over a long values list. For rows in which that won't work, we already built the eval state at plan startup.", "Pass parent as NULL, not my plan node, because we don't want anything in this transient state linking into permanent state. The only expression type that might wish to do so is a SubPlan, and we already checked that there aren't any."]}, {"code": "case T_ValuesScan:\n\t\t\tpname = sname = \"Values Scan\";\n\t\t\tbreak;", "title": "EXPLAIN identity in core source"}], "strategies": [], "description": ["Evaluates and scans a VALUES row list."], "evidence_kind": "source and documentation", "explain_names": ["Values Scan"], "partial_modes": [], "comparison_data": {"node_tag": "T_ValuesScan", "strategies": [], "text_names": ["Values Scan"], "initializer": "ExecInitValuesScan", "partial_modes": [], "memory_mechanism": "unclassified", "parallel_callbacks": []}, "comparison_hash": "a0f7ecd83c2ff3883a8f6be3d13bd28e040a53da79545a3140489e6b4a0e75e8", "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/nodeValuesscan.c"}, "parallel_callbacks": []}, "comparison": {"left": "17", "right": "18", "status": "unchanged", "diff": ""}}