Marc Mamin <m.ma...@intershop.de> writes:
> Now I have generated queries that include cast information in order to ensure
> that the indexes get used.
> e.g.: WHERE month1.foo = cast('XY' as character(2))
> with mixed type, this should become something like:
> SELECT ... FROM month1
> WHERE month1.foo = cast('XY' as character(2))
> UNION ALL
> SELECT... FROM month2
> WHERE month2.foo = cast('XY' as varchar)
> which is quite complicated to resolve in our "query builder framework"
> There seems to be no way to have dynamic casting, something like:
> WHERE month2.foo = cast('XY' as 'month2.foo'::regtype)
> Is there a way for it ?
If the comparison values are always string literals, then you should just
drop the casts altogether, ie
WHERE month2.foo = 'XY'
In this sort of situation the literal's type is preferentially resolved as
being the same as whatever it's being compared to.
regards, tom lane
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