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Operators live in namespaces. CREATE/DROP/COMMENT ON OPERATOR take

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qualified operator names directly, for example CREATE OPERATOR myschema.+
( ... ).  To qualify an operator name in an expression you need to write
OPERATOR(myschema.+) (thanks to Peter for suggesting an escape hatch).
I also took advantage of having to reformat pg_operator to fix something
that'd been bugging me for a while: mergejoinable operators should have
explicit links to the associated cross-data-type comparison operators,
rather than hardwiring an assumption that they are named < and >.
This commit is contained in:
Tom Lane
2002-04-16 23:08:12 +00:00
parent 4da51bfd6d
commit 6cef5d2549
39 changed files with 1953 additions and 1803 deletions
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47
src/backend/utils/cache/lsyscache.c vendored
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.69 2002/04/05 00:31:30 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.70 2002/04/16 23:08:11 tgl Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
@ -378,10 +378,6 @@ op_mergejoinable(Oid opno, Oid ltype, Oid rtype, Oid *leftOp, Oid *rightOp)
* ltype ">" rtype) for an operator previously determined to be
* mergejoinable. Optionally, fetches the regproc ids of these
* operators, as well as their operator OIDs.
*
* Raises error if operators cannot be found. Assuming that the operator
* had indeed been marked mergejoinable, this indicates that whoever marked
* it so was mistaken.
*/
void
op_mergejoin_crossops(Oid opno, Oid *ltop, Oid *gtop,
@ -389,11 +385,9 @@ op_mergejoin_crossops(Oid opno, Oid *ltop, Oid *gtop,
{
HeapTuple tp;
Form_pg_operator optup;
Oid oprleft,
oprright;
/*
* Get the declared left and right operand types of the operator.
* Get the declared comparison operators of the operator.
*/
tp = SearchSysCache(OPEROID,
ObjectIdGetDatum(opno),
@ -401,44 +395,23 @@ op_mergejoin_crossops(Oid opno, Oid *ltop, Oid *gtop,
if (!HeapTupleIsValid(tp)) /* shouldn't happen */
elog(ERROR, "op_mergejoin_crossops: operator %u not found", opno);
optup = (Form_pg_operator) GETSTRUCT(tp);
oprleft = optup->oprleft;
oprright = optup->oprright;
*ltop = optup->oprltcmpop;
*gtop = optup->oprgtcmpop;
ReleaseSysCache(tp);
/*
* Look up the "<" operator with the same input types. If there isn't
* one, whoever marked the "=" operator mergejoinable was a loser.
*/
tp = SearchSysCache(OPERNAME,
PointerGetDatum("<"),
ObjectIdGetDatum(oprleft),
ObjectIdGetDatum(oprright),
CharGetDatum('b'));
if (!HeapTupleIsValid(tp))
/* Check < op provided */
if (!OidIsValid(*ltop))
elog(ERROR, "op_mergejoin_crossops: mergejoin operator %u has no matching < operator",
opno);
optup = (Form_pg_operator) GETSTRUCT(tp);
*ltop = tp->t_data->t_oid;
if (ltproc)
*ltproc = optup->oprcode;
ReleaseSysCache(tp);
*ltproc = get_opcode(*ltop);
/*
* And the same for the ">" operator.
*/
tp = SearchSysCache(OPERNAME,
PointerGetDatum(">"),
ObjectIdGetDatum(oprleft),
ObjectIdGetDatum(oprright),
CharGetDatum('b'));
if (!HeapTupleIsValid(tp))
/* Check > op provided */
if (!OidIsValid(*gtop))
elog(ERROR, "op_mergejoin_crossops: mergejoin operator %u has no matching > operator",
opno);
optup = (Form_pg_operator) GETSTRUCT(tp);
*gtop = tp->t_data->t_oid;
if (gtproc)
*gtproc = optup->oprcode;
ReleaseSysCache(tp);
*gtproc = get_opcode(*gtop);
}
/*

8
src/backend/utils/cache/syscache.c vendored
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/cache/syscache.c,v 1.76 2002/04/11 20:00:06 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/syscache.c,v 1.77 2002/04/16 23:08:11 tgl Exp $
*
* NOTES
* These routines allow the parser/planner/executor to perform
@ -273,15 +273,15 @@ static const struct cachedesc cacheinfo[] = {
0,
0
}},
{OperatorRelationName, /* OPERNAME */
OperatorNameIndex,
{OperatorRelationName, /* OPERNAMENSP */
OperatorNameNspIndex,
0,
4,
{
Anum_pg_operator_oprname,
Anum_pg_operator_oprleft,
Anum_pg_operator_oprright,
Anum_pg_operator_oprkind
Anum_pg_operator_oprnamespace
}},
{OperatorRelationName, /* OPEROID */
OperatorOidIndex,