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Optimize update of tables with generated columns

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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
This commit is contained in:
Peter Eisentraut
2020-02-17 15:19:58 +01:00
parent ad3ae64770
commit c6679e4fca
5 changed files with 38 additions and 10 deletions
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2
src/include/executor/nodeModifyTable.h
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@@ -15,7 +15,7 @@
#include "nodes/execnodes.h"
extern void ExecComputeStoredGenerated(EState *estate, TupleTableSlot *slot);
extern void ExecComputeStoredGenerated(EState *estate, TupleTableSlot *slot, CmdType cmdtype);
extern ModifyTableState *ExecInitModifyTable(ModifyTable *node, EState *estate, int eflags);
extern void ExecEndModifyTable(ModifyTableState *node);