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This is an SQL-standard feature that allows creating columns that are computed from expressions rather than assigned, similar to a view or materialized view but on a column basis. This implements one kind of generated column: stored (computed on write). Another kind, virtual (computed on read), is planned for the future, and some room is left for it. Reviewed-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/b151f851-4019-bdb1-699e-ebab07d2f40a@2ndquadrant.com
25 lines
787 B
C
25 lines
787 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) 1996-2019, 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);
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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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