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Revise hash join and hash aggregation code to use the same datatype-

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specific hash functions used by hash indexes, rather than the old
not-datatype-aware ComputeHashFunc routine.  This makes it safe to do
hash joining on several datatypes that previously couldn't use hashing.
The sets of datatypes that are hash indexable and hash joinable are now
exactly the same, whereas before each had some that weren't in the other.
This commit is contained in:
Tom Lane
2003-06-22 22:04:55 +00:00
parent 0dda75f6eb
commit bff0422b6c
27 changed files with 489 additions and 232 deletions
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7
src/include/access/hash.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: hash.h,v 1.47 2002/06/20 20:29:42 momjian Exp $
* $Id: hash.h,v 1.48 2003/06/22 22:04:54 tgl Exp $
*
* NOTES
* modeled after Margo Seltzer's hash implementation for unix.
@@ -251,9 +251,11 @@ extern Datum hashbulkdelete(PG_FUNCTION_ARGS);
/*
* Datatype-specific hash functions in hashfunc.c.
*
* These support both hash indexes and hash joins.
*
* NOTE: some of these are also used by catcache operations, without
* any direct connection to hash indexes. Also, the common hash_any
* routine is also used by dynahash tables and hash joins.
* routine is also used by dynahash tables.
*/
extern Datum hashchar(PG_FUNCTION_ARGS);
extern Datum hashint2(PG_FUNCTION_ARGS);
@@ -265,6 +267,7 @@ extern Datum hashfloat8(PG_FUNCTION_ARGS);
extern Datum hashoidvector(PG_FUNCTION_ARGS);
extern Datum hashint2vector(PG_FUNCTION_ARGS);
extern Datum hashname(PG_FUNCTION_ARGS);
extern Datum hashtext(PG_FUNCTION_ARGS);
extern Datum hashvarlena(PG_FUNCTION_ARGS);
extern Datum hash_any(register const unsigned char *k, register int keylen);