From: | "Andrey M(dot) Borodin" <x4mmm(at)yandex-team(dot)ru> |
---|---|
To: | Paul Jungwirth <pj(at)illuminatedcomputing(dot)com> |
Cc: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: Add GiST support for mixed-width integer operators |
Date: | 2024-07-06 12:04:27 |
Message-ID: | 8A2355DE-A969-4CAB-B660-C7464EE3B899@yandex-team.ru |
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Lists: | pgsql-hackers |
> On 5 Jul 2024, at 23:46, Paul Jungwirth <pj(at)illuminatedcomputing(dot)com> wrote:
>
> this commit adds support for all combinations of int2/int4/int8 for all five btree operators (</<=/=/>=/>).
Looks like a nice feature to have.
Would it make sense to do something similar to float8? Or, perhaps, some other types from btree_gist?
Also, are we sure such tests will be stable?
+SET enable_seqscan=on;
+-- It should use the index with a different integer width:
+EXPLAIN (COSTS OFF)
+SELECT count(*) FROM int4tmp WHERE a = smallint '42';
+ QUERY PLAN
+------------------------------------------------
+ Aggregate
+ -> Bitmap Heap Scan on int4tmp
+ Recheck Cond: (a = '42'::smallint)
+ -> Bitmap Index Scan on int4idx
+ Index Cond: (a = '42'::smallint)
Best regards, Andrey Borodin.
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