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Re: Regression in IN( field, field, field ) performance - Mailing list pgsql-hackers

From Tom Lane
Subject Re: Regression in IN( field, field, field ) performance
Date
Msg-id 27464.1224608765@sss.pgh.pa.us
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In response to Regression in IN( field, field, field ) performance  (Jim 'Decibel!' Nasby <jnasby@cashnetusa.com>)
Responses Re: Regression in IN( field, field, field ) performance
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"Jim 'Decibel!' Nasby" <jnasby@cashnetusa.com> writes:
>        WHERE '12814474045' IN (people.home_phone, people.work_phone,  
> people.mobile_phone)

> Yeah, not exactly a common case, but at least in 8.1 this was turned  
> into a set of ORs. Starting in 8.2 and in current HEAD, the planner  
> turns that into:

> Filter: ('12814474045'::text = ANY ((ARRAY[home_phone, mobile_phone,  
> work_phone])::text[]))

> Which means automatic seqscan.

It means no such thing.
        regards, tom lane

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