Stefan Keller <[email protected]> writes:
> I'm trying to optimize the latter query:
> # SELECT id, (kvp->'a') FROM mytable WHERE kvp ? 'a';
The hstore gist and gin opclasses contain support for that.
> ...or something like this (which also involves the '->' operator)
> # SELECT id FROM mytable WHERE (kvp->'a') = 'x';
You could transform this into a gist/gin indexable query
kvp @> ('a' => 'x')
although I think the actually indexed part of it is just the search for
rows that contain key 'a', so it's not really any better than
kvp ? 'a' AND (kvp->'a') = 'x'
performance-wise.
regards, tom lane
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