diff options
Diffstat (limited to 'src/backend/access/hash/hashutil.c')
| -rw-r--r-- | src/backend/access/hash/hashutil.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/src/backend/access/hash/hashutil.c b/src/backend/access/hash/hashutil.c index eadbe7aabe5..afa7c09a53d 100644 --- a/src/backend/access/hash/hashutil.c +++ b/src/backend/access/hash/hashutil.c @@ -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) @@ -76,6 +80,31 @@ _hash_datum2hashkey(Relation rel, Datum 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. */ Bucket |