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Add some opfamily support functions to lsyscache.c

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Add get_opfamily_method() and get_opfamily_member_for_cmptype() in
lsyscache.c.  No callers yet, but we'll add some soon.  This is part
of generalizing some parts of the code away from having btree
hardcoded and use CompareType instead.

Author: Mark Dilger <mark.dilger@enterprisedb.com>
Discussion: https://www.postgresql.org/message-id/flat/E72EAA49-354D-4C2E-8EB9-255197F55330@enterprisedb.com
This commit is contained in:
Peter Eisentraut
2025-03-18 11:17:43 +01:00
parent 122a9af5de
commit 7317e64126
2 changed files with 48 additions and 0 deletions
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44
src/backend/utils/cache/lsyscache.c vendored
View File

@ -184,6 +184,28 @@ get_opfamily_member(Oid opfamily, Oid lefttype, Oid righttype,
return result;
}
/*
* get_opfamily_member_for_cmptype
* Get the OID of the operator that implements the specified comparison
* type with the specified datatypes for the specified opfamily.
*
* Returns InvalidOid if there is no mapping for the comparison type or no
* pg_amop entry for the given keys.
*/
Oid
get_opfamily_member_for_cmptype(Oid opfamily, Oid lefttype, Oid righttype,
CompareType cmptype)
{
Oid opmethod;
StrategyNumber strategy;
opmethod = get_opfamily_method(opfamily);
strategy = IndexAmTranslateCompareType(cmptype, opmethod, opfamily, true);
if (!strategy)
return InvalidOid;
return get_opfamily_member(opfamily, lefttype, righttype, strategy);
}
/*
* get_ordering_op_properties
* Given the OID of an ordering operator (a btree "<" or ">" operator),
@ -1288,6 +1310,28 @@ get_opclass_method(Oid opclass)
/* ---------- OPFAMILY CACHE ---------- */
/*
* get_opfamily_method
*
* Returns the OID of the index access method the opfamily is for.
*/
Oid
get_opfamily_method(Oid opfid)
{
HeapTuple tp;
Form_pg_opfamily opfform;
Oid result;
tp = SearchSysCache1(OPFAMILYOID, ObjectIdGetDatum(opfid));
if (!HeapTupleIsValid(tp))
elog(ERROR, "cache lookup failed for operator family %u", opfid);
opfform = (Form_pg_opfamily) GETSTRUCT(tp);
result = opfform->opfmethod;
ReleaseSysCache(tp);
return result;
}
char *
get_opfamily_name(Oid opfid, bool missing_ok)
{

4
src/include/utils/lsyscache.h
View File

@ -14,6 +14,7 @@
#define LSYSCACHE_H
#include "access/attnum.h"
#include "access/cmptype.h"
#include "access/htup.h"
#include "nodes/pg_list.h"
@ -74,6 +75,8 @@ extern void get_op_opfamily_properties(Oid opno, Oid opfamily, bool ordering_op,
Oid *righttype);
extern Oid get_opfamily_member(Oid opfamily, Oid lefttype, Oid righttype,
int16 strategy);
extern Oid get_opfamily_member_for_cmptype(Oid opfamily, Oid lefttype, Oid righttype,
CompareType cmptype);
extern bool get_ordering_op_properties(Oid opno,
Oid *opfamily, Oid *opcintype, int16 *strategy);
extern Oid get_equality_op_for_ordering_op(Oid opno, bool *reverse);
@ -108,6 +111,7 @@ extern Oid get_opclass_input_type(Oid opclass);
extern bool get_opclass_opfamily_and_input_type(Oid opclass,
Oid *opfamily, Oid *opcintype);
extern Oid get_opclass_method(Oid opclass);
extern Oid get_opfamily_method(Oid opfid);
extern char *get_opfamily_name(Oid opfid, bool missing_ok);
extern RegProcedure get_opcode(Oid opno);
extern char *get_opname(Oid opno);