Re: Numeric performances

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От Tom Lane
Тема Re: Numeric performances
Дата
Msg-id 19101.1180967738@sss.pgh.pa.us
обсуждение исходный текст
Ответ на Re: Numeric performances  (Vincenzo Romano <vincenzo.romano@gmail.com>)
Ответы Re: Numeric performances
Список pgsql-general
Vincenzo Romano <vincenzo.romano@gmail.com> writes:
> It sounds quite strange to me that numeric is faster than bigint.

This test is 100% faulty, because it fails to consider the fact that the
accumulator used by sum() isn't necessarily the same type as the input
data.  In fact we sum ints in a bigint and bigints in a numeric to avoid
overflow.

If you try it with max() you'd likely get less-surprising answers.

            regards, tom lane

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