On Wed, Sep 04, 2013 at 12:08:48PM +0800, wangshuo@highgo.com.cn wrote:
> I find that it takes a long time when I increase the scale of a numeric
> datatype.
> By checking the code, I found that's because it needs to rewrite that
> table's file.
> After checking that table's data file, I found only parameter n_header
> changed.
> And, I found the data in that numeric field never changed.
> So I thank It's not necessary to rewrite the table's file in this case.
n_header is part of the numeric field's data. That's not just pedantry: the
display scale stored in n_header affects how numeric_out() formats the value.
--
Noah Misch
EnterpriseDB http://www.enterprisedb.com