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Generated columns

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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
This commit is contained in:
Peter Eisentraut
2019-03-30 08:13:09 +01:00
parent 6b8b5364dd
commit fc22b6623b
84 changed files with 3067 additions and 157 deletions
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11
src/backend/executor/execReplication.c
View File

@@ -21,6 +21,7 @@
#include "access/xact.h"
#include "commands/trigger.h"
#include "executor/executor.h"
#include "executor/nodeModifyTable.h"
#include "nodes/nodeFuncs.h"
#include "parser/parse_relation.h"
#include "parser/parsetree.h"
@@ -412,6 +413,11 @@ ExecSimpleRelationInsert(EState *estate, TupleTableSlot *slot)
{
List *recheckIndexes = NIL;
/* Compute stored generated columns */
if (rel->rd_att->constr &&
rel->rd_att->constr->has_generated_stored)
ExecComputeStoredGenerated(estate, slot);
/* Check the constraints of the tuple */
if (rel->rd_att->constr)
ExecConstraints(resultRelInfo, slot, estate);
@@ -473,6 +479,11 @@ ExecSimpleRelationUpdate(EState *estate, EPQState *epqstate,
List *recheckIndexes = NIL;
bool update_indexes;
/* Compute stored generated columns */
if (rel->rd_att->constr &&
rel->rd_att->constr->has_generated_stored)
ExecComputeStoredGenerated(estate, slot);
/* Check the constraints of the tuple */
if (rel->rd_att->constr)
ExecConstraints(resultRelInfo, slot, estate);