Numeric 508 datatype

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От Simon Riggs
Тема Numeric 508 datatype
Дата
Msg-id 1132161229.4959.12.camel@localhost.localdomain
обсуждение исходный текст
Ответы Re: Numeric 508 datatype  (Andreas Pflug <pgadmin@pse-consulting.de>)
Re: Numeric 508 datatype  (Bruce Momjian <pgman@candle.pha.pa.us>)
Re: Numeric 508 datatype  (Bruce Momjian <pgman@candle.pha.pa.us>)
Список pgsql-patches
Now we're into 8.2devel mode, its time to submit the previously
discussed patch that:

- reduces Numeric storage format by 2 bytes
- limits scale to +/- 508 decimal places

This is sufficient to allow Numeric to continue to be used as the
default numeric representation for all numbers in the parser.

Passes: make check on cvstip, as well as some tests not in there.

Code comments explain the new format and consequences.

As previously agreed, reviewing this is a 2 stage process:
1. review/possibly agree OK to commit
2. check with everybody on GENERAL that the restriction to 508 is
acceptable

Figure there's no point doing (2) until we agree the proposal/code is
workable.

As Atsushi-san point out, there is also come CPU optimization to be done
on Numeric comparison, and also on other areas such as aggregation. I've
not done this yet.

Best Regards, Simon Riggs

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