Re: BUG #17428: last_value incorrect for uninitialized sequence

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От
Tom Lane
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Re: BUG #17428: last_value incorrect for uninitialized sequence
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192171.1646666622@sss.pgh.pa.us
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BUG #17428: last_value incorrect for uninitialized sequence PG Bug reporting form <noreply@postgresql.org>
Re: BUG #17428: last_value incorrect for uninitialized sequence "David G. Johnston" <david.g.johnston@gmail.com>
Re: BUG #17428: last_value incorrect for uninitialized sequence Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #17428: last_value incorrect for uninitialized sequence Glen Edmonds <glen.edmonds@gmail.com>
Re: BUG #17428: last_value incorrect for uninitialized sequence Tom Lane <tgl@sss.pgh.pa.us>
Re: BUG #17428: last_value incorrect for uninitialized sequence "David G. Johnston" <david.g.johnston@gmail.com>
Glen Edmonds  writes:
> The problem really is that the two states of not initialized and post first
> usage are indistinguishable (both return 1), but the sequence next value is
> different.

They're not indistinguishable: if you look at the is_called flag
you'll see that it changes.

> ie it’s a reasonable expectation that the next value is
> last_value + 1. IMHO violating this makes it a bug.

You can call it that if you like, but it's operating as designed
and documented.  I fear it's about twenty years too late to propose
a redesign.

			regards, tom lane


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