Stephen Davies wrote:
> Interesting semantics. I have never seen the IN syntax referred to as
> "array processing" before.
>
> I have always thought of array processing as the thing that vector
> processors such as Cray and ETA do/did.
>
> While superficially equivalent, I have always believed that IN (a,b,c)
> executed faster than =a or =b or =c. Am I wrong for PostgreSQL?
Older versions of Postgres translated IN (a, b, c) into an OR'ed list of
equalities. Nowadays it is treated as an array; I think it's translated
to = ANY ({a,b,c}), as you can see in the message you posted at the
start of this thread.
I don't think you showed us the EXPLAIN ANALYZE results that Scott
requested.
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Alvaro Herrera http://www.CommandPrompt.com/
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