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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: Josh Berkus <josh@agliodbs.com>
Cc: Tim Dudgeon <tdudgeon.ml@gmail.com>
Cc: pgsql-sql@postgresql.org
Cc: pgsql-performance@postgresql.org
Subject: Re: Re: [SQL] querying with index on jsonb slower than standard column. Why?
Date: Fri, 12 Dec 2014 16:44:10 -0500
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Josh Berkus <josh@agliodbs.com> writes:
> Yeah, I believe the core problem is that Postgres currently doesn't have
> any way to have variadic return times from a function which don't match
> variadic input types. Returning a value as an actual numeric from JSONB
> would require returning a numeric from a function whose input type is
> text or json. So a known issue but one which would require a lot of
> replumbing to fix.
Well, it'd be easy to fix if we were willing to invent distinct operators
depending on which type you wanted out (perhaps ->> for text output as
today, add ->># for numeric output, etc). Doesn't seem terribly nice
from a usability standpoint though.
The usability issue could be fixed by teaching the planner to fold a
construct like (jsonb ->> 'foo')::numeric into (jsonb ->># 'foo').
But I'm not sure how we do that except in a really ugly and ad-hoc
fashion.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, josh@agliodbs.com, tdudgeon.ml@gmail.com, pgsql-performance@postgresql.org
Subject: Re: Re: [SQL] querying with index on jsonb slower than standard column. Why?
In-Reply-To: <8867.1418420650@sss.pgh.pa.us>
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