PostgreSQL Bugs List wrote:
This is a known issue with versions prior to 8.0. When you provide a
constant integer smaller than 2^31 it assumes you want int4. Of course,
the planner then looks for an int4 index and can't find one.

The solution/workaround is to make sure you specify the type of your
constant, or at least make sure it doesn't look like an int4.
select * from x where x.id = 12345::int8;
select * from x where x.id = CAST(12345 AS int8);
select * from x where x.id = '12345';

The last works because '...' is type unknown so it looks at x.id to see
what type it wants and casts for you.

HTH

--
Richard Huxton
Archonet Ltd

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