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Add support for cross-type hashing in hash index searches and hash joins.

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Hashing for aggregation purposes still needs work, so it's not time to
mark any cross-type operators as hashable for general use, but these cases
work if the operators are so marked by hand in the system catalogs.
This commit is contained in:
Tom Lane
2007-01-30 01:33:36 +00:00
parent e8cd6f14a2
commit a635c08fa1
12 changed files with 240 additions and 82 deletions
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31
src/backend/access/hash/hashutil.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/hash/hashutil.c,v 1.50 2007/01/05 22:19:22 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/hash/hashutil.c,v 1.51 2007/01/30 01:33:36 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -18,6 +18,7 @@
#include "access/hash.h"
#include "access/reloptions.h"
#include "executor/execdebug.h"
#include "utils/lsyscache.h"
/*
@@ -63,6 +64,9 @@ _hash_checkqual(IndexScanDesc scan, IndexTuple itup)
/*
* _hash_datum2hashkey -- given a Datum, call the index's hash procedure
*
* The Datum is assumed to be of the index's column type, so we can use the
* "primary" hash procedure that's tracked for us by the generic index code.
*/
uint32
_hash_datum2hashkey(Relation rel, Datum key)
@@ -75,6 +79,31 @@ _hash_datum2hashkey(Relation rel, Datum key)
return DatumGetUInt32(FunctionCall1(procinfo, key));
}
/*
* _hash_datum2hashkey_type -- given a Datum of a specified type,
* hash it in a fashion compatible with this index
*
* This is much more expensive than _hash_datum2hashkey, so use it only in
* cross-type situations.
*/
uint32
_hash_datum2hashkey_type(Relation rel, Datum key, Oid keytype)
{
RegProcedure hash_proc;
/* XXX assumes index has only one attribute */
hash_proc = get_opfamily_proc(rel->rd_opfamily[0],
keytype,
keytype,
HASHPROC);
if (!RegProcedureIsValid(hash_proc))
elog(ERROR, "missing support function %d(%u,%u) for index \"%s\"",
HASHPROC, keytype, keytype,
RelationGetRelationName(rel));
return DatumGetUInt32(OidFunctionCall1(hash_proc, key));
}
/*
* _hash_hashkey2bucket -- determine which bucket the hashkey maps to.
*/