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Divide functions into three volatility classes (immutable, stable, and

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volatile), rather than the old cachable/noncachable distinction.  This
allows indexscan optimizations in many places where we formerly didn't.
Also, add a pronamespace column to pg_proc (it doesn't do anything yet,
however).
This commit is contained in:
Tom Lane
2002-04-05 00:31:36 +00:00
parent 0e11aea246
commit 4bdb4be62e
26 changed files with 1668 additions and 1542 deletions
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15
src/backend/commands/indexcmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/indexcmds.c,v 1.66 2002/03/31 06:26:30 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/indexcmds.c,v 1.67 2002/04/05 00:31:26 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -21,6 +21,7 @@
#include "catalog/index.h"
#include "catalog/namespace.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_proc.h"
#include "commands/defrem.h"
#include "miscadmin.h"
#include "optimizer/clauses.h"
@ -233,11 +234,11 @@ CheckPredicate(List *predList, List *rangeTable, Oid baseRelOid)
elog(ERROR, "Cannot use aggregate in index predicate");
/*
* A predicate using noncachable functions is probably wrong, for the
* A predicate using mutable functions is probably wrong, for the
* same reasons that we don't allow a functional index to use one.
*/
if (contain_noncachable_functions((Node *) predList))
elog(ERROR, "Cannot use non-cachable function in index predicate");
if (contain_mutable_functions((Node *) predList))
elog(ERROR, "Functions in index predicate must be marked isImmutable");
}
@ -320,13 +321,13 @@ FuncIndexArgs(IndexInfo *indexInfo,
}
/*
* Require that the function be marked cachable. Using a noncachable
* Require that the function be marked immutable. Using a mutable
* function for a functional index is highly questionable, since if
* you aren't going to get the same result for the same data every
* time, it's not clear what the index entries mean at all.
*/
if (!func_iscachable(funcid))
elog(ERROR, "DefineIndex: index function must be marked iscachable");
if (func_volatile(funcid) != PROVOLATILE_IMMUTABLE)
elog(ERROR, "DefineIndex: index function must be marked isImmutable");
/* Process opclass, using func return type as default type */