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Cause CHAR(n) to TEXT or VARCHAR conversion to automatically strip trailing

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blanks, in hopes of reducing the surprise factor for newbies.  Remove
redundant operators for VARCHAR (it depends wholly on TEXT operations now).
Clean up resolution of ambiguous operators/functions to avoid surprising
choices for domains: domains are treated as equivalent to their base types
and binary-coercibility is no longer considered a preference item when
choosing among multiple operators/functions.  IsBinaryCoercible now correctly
reflects the notion that you need *only* relabel the type to get from type
A to type B: that is, a domain is binary-coercible to its base type, but
not vice versa.  Various marginal cleanup, including merging the essentially
duplicate resolution code in parse_func.c and parse_oper.c.  Improve opr_sanity
regression test to understand about binary compatibility (using pg_cast),
and fix a couple of small errors in the catalogs revealed thereby.
Restructure "special operator" handling to fetch operators via index opclasses
rather than hardwiring assumptions about names (cleans up the pattern_ops
stuff a little).
This commit is contained in:
Tom Lane
2003-05-26 00:11:29 +00:00
parent 297c1658ed
commit f45df8c014
36 changed files with 1012 additions and 1560 deletions
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29
src/backend/utils/cache/lsyscache.c vendored
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@ -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 1.94 2003/05/13 04:38:58 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/lsyscache.c,v 1.95 2003/05/26 00:11:27 tgl Exp $
*
* NOTES
* Eventually, the index information should go through here, too.
@ -80,6 +80,33 @@ op_requires_recheck(Oid opno, Oid opclass)
return result;
}
/*
* get_opclass_member
* Get the OID of the operator that implements the specified strategy
* for the specified opclass.
*
* Returns InvalidOid if there is no pg_amop entry for the given keys.
*/
Oid
get_opclass_member(Oid opclass, int16 strategy)
{
HeapTuple tp;
Form_pg_amop amop_tup;
Oid result;
tp = SearchSysCache(AMOPSTRATEGY,
ObjectIdGetDatum(opclass),
Int16GetDatum(strategy),
0, 0);
if (!HeapTupleIsValid(tp))
return InvalidOid;
amop_tup = (Form_pg_amop) GETSTRUCT(tp);
result = amop_tup->amopopr;
ReleaseSysCache(tp);
return result;
}
/* ---------- ATTRIBUTE CACHES ---------- */
/*