Re: numeric/decimal docs bug?
От | Bruce Momjian |
---|---|
Тема | Re: numeric/decimal docs bug? |
Дата | |
Msg-id | 200203112202.g2BM2Pp19522@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Re: numeric/decimal docs bug? (Jan Wieck <janwieck@yahoo.com>) |
Ответы |
Re: numeric/decimal docs bug?
Re: numeric/decimal docs bug? |
Список | pgsql-hackers |
Jan Wieck wrote: > > The hard limit is certainly no more than 64K, since we store these > > numbers in half of an atttypmod. In practice I suspect the limit may > > be less; Jan would be more likely to remember... > > It is arbitrary of course. I don't recall completely, have to > dig into the code, but there might be some side effect when > mucking with it. > > The NUMERIC code increases the actual internal precision when > doing multiply and divide, what happens a gazillion times > when doing higher functions like trigonometry. I think there > was some connection between the max precision and how high > this internal precision can grow, so increasing the precision > might affect the computational performance of such higher > functions significantly. Oh, interesting, maybe we should just leave it alone. -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania19026
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