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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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19
src/backend/parser/parse_relation.c
View File

@ -731,6 +731,17 @@ scanRTEForColumn(ParseState *pstate, RangeTblEntry *rte, const char *colname,
colname),
parser_errposition(pstate, location)));
/*
* In generated column, no system column is allowed except tableOid.
*/
if (pstate->p_expr_kind == EXPR_KIND_GENERATED_COLUMN &&
attnum < InvalidAttrNumber && attnum != TableOidAttributeNumber)
ereport(ERROR,
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
errmsg("cannot use system column \"%s\" in column generation expression",
colname),
parser_errposition(pstate, location)));
if (attnum != InvalidAttrNumber)
{
/* now check to see if column actually is defined */
@ -1257,6 +1268,7 @@ addRangeTableEntry(ParseState *pstate,
rte->selectedCols = NULL;
rte->insertedCols = NULL;
rte->updatedCols = NULL;
rte->extraUpdatedCols = NULL;
/*
* Add completed RTE to pstate's range table list, but not to join list
@ -1328,6 +1340,7 @@ addRangeTableEntryForRelation(ParseState *pstate,
rte->selectedCols = NULL;
rte->insertedCols = NULL;
rte->updatedCols = NULL;
rte->extraUpdatedCols = NULL;
/*
* Add completed RTE to pstate's range table list, but not to join list
@ -1407,6 +1420,7 @@ addRangeTableEntryForSubquery(ParseState *pstate,
rte->selectedCols = NULL;
rte->insertedCols = NULL;
rte->updatedCols = NULL;
rte->extraUpdatedCols = NULL;
/*
* Add completed RTE to pstate's range table list, but not to join list
@ -1670,6 +1684,7 @@ addRangeTableEntryForFunction(ParseState *pstate,
rte->selectedCols = NULL;
rte->insertedCols = NULL;
rte->updatedCols = NULL;
rte->extraUpdatedCols = NULL;
/*
* Add completed RTE to pstate's range table list, but not to join list
@ -1733,6 +1748,7 @@ addRangeTableEntryForTableFunc(ParseState *pstate,
rte->selectedCols = NULL;
rte->insertedCols = NULL;
rte->updatedCols = NULL;
rte->extraUpdatedCols = NULL;
/*
* Add completed RTE to pstate's range table list, but not to join list
@ -1811,6 +1827,7 @@ addRangeTableEntryForValues(ParseState *pstate,
rte->selectedCols = NULL;
rte->insertedCols = NULL;
rte->updatedCols = NULL;
rte->extraUpdatedCols = NULL;
/*
* Add completed RTE to pstate's range table list, but not to join list
@ -1881,6 +1898,7 @@ addRangeTableEntryForJoin(ParseState *pstate,
rte->selectedCols = NULL;
rte->insertedCols = NULL;
rte->updatedCols = NULL;
rte->extraUpdatedCols = NULL;
/*
* Add completed RTE to pstate's range table list, but not to join list
@ -1983,6 +2001,7 @@ addRangeTableEntryForCTE(ParseState *pstate,
rte->selectedCols = NULL;
rte->insertedCols = NULL;
rte->updatedCols = NULL;
rte->extraUpdatedCols = NULL;
/*
* Add completed RTE to pstate's range table list, but not to join list