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When updating a table row with generated columns, only recompute those generated columns whose base columns have changed in this update and keep the rest unchanged. This can result in a significant performance benefit. The required information was already kept in RangeTblEntry.extraUpdatedCols; we just have to make use of it. Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/b05e781a-fa16-6b52-6738-761181204567@2ndquadrant.com
24 lines
804 B
C
24 lines
804 B
C
/*-------------------------------------------------------------------------
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*
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* nodeModifyTable.h
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*
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*
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* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/executor/nodeModifyTable.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef NODEMODIFYTABLE_H
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#define NODEMODIFYTABLE_H
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#include "nodes/execnodes.h"
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extern void ExecComputeStoredGenerated(EState *estate, TupleTableSlot *slot, CmdType cmdtype);
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extern ModifyTableState *ExecInitModifyTable(ModifyTable *node, EState *estate, int eflags);
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extern void ExecEndModifyTable(ModifyTableState *node);
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extern void ExecReScanModifyTable(ModifyTableState *node);
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#endif /* NODEMODIFYTABLE_H */
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