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Hash support for row types

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Add hash functions for the record type as well as a hash operator
family and operator class for the record type.  This enables all the
hash functionality for the record type such as hash-based plans for
UNION/INTERSECT/EXCEPT DISTINCT, recursive queries using UNION
DISTINCT, hash joins, and hash partitioning.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/38eccd35-4e2d-6767-1b3c-dada1eac3124%402ndquadrant.com
This commit is contained in:
Peter Eisentraut
2020-11-19 09:24:37 +01:00
parent 7888b09994
commit 01e658fa74
19 changed files with 462 additions and 75 deletions
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7
src/backend/utils/cache/lsyscache.c vendored
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@@ -1358,13 +1358,18 @@ op_hashjoinable(Oid opno, Oid inputtype)
TypeCacheEntry *typentry;
/* As in op_mergejoinable, let the typcache handle the hard cases */
/* Eventually we'll need a similar case for record_eq ... */
if (opno == ARRAY_EQ_OP)
{
typentry = lookup_type_cache(inputtype, TYPECACHE_HASH_PROC);
if (typentry->hash_proc == F_HASH_ARRAY)
result = true;
}
else if (opno == RECORD_EQ_OP)
{
typentry = lookup_type_cache(inputtype, TYPECACHE_HASH_PROC);
if (typentry->hash_proc == F_HASH_RECORD)
result = true;
}
else
{
/* For all other operators, rely on pg_operator.oprcanhash */