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Re: Question about cost-calculation - Mailing list pgsql-general

From Tom Lane
Subject Re: Question about cost-calculation
Date
Msg-id 17613.1212415037@sss.pgh.pa.us
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In response to Question about cost-calculation  ("A. Kretschmer" <andreas.kretschmer@schollglas.com>)
Responses Re: Question about cost-calculation  ("A. Kretschmer" <andreas.kretschmer@schollglas.com>)
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"A. Kretschmer" <andreas.kretschmer@schollglas.com> writes:
> i expected for a 1000 row test-table a cost per function of 2.5
> (cpu_operator_cost = 0.0025), but i got 5.

What's the data type of "i"?  I suspect you really have two function
calls in that expression: a type coercion function and cos() itself.

            regards, tom lane

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