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From: Tom Lane <[email protected]>
To: Quentin de Metz <[email protected]>
Cc: [email protected]
Subject: Re: btree_gin, bigint and number literals
Date: Fri, 31 Jan 2025 15:42:49 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

"Quentin de Metz" <[email protected]> writes:
> On a multi-column GIN index over a bigint column and a text column, the query planner does not filter the index on the bigint column when a condition on this column is specified with a number literal.

Yeah, because "owner_id = 12" will use int84eq, which as you observe
is not supported by btree_gin's opclass.

> Would you be open to considering a patch to include the ALTER OPERATOR snippet in the btree_gin install script, so that this works out of the box?

I'd be quite surprised if that "just works" without any corresponding
changes in the C code, because btree_gin.c only knows about applying
same-type-on-both-sides comparison functions.  (int8 vs int4 might
appear to work as long as you don't try very hard, but for example
it'd fail on 32-bit or big-endian hardware.)  If you feel like writing
a patch that actually takes care of the matter fully, step right up.

			regards, tom lane

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