Re: identity columns

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>
Cc: Andres Freund <andres(at)anarazel(dot)de>, Vitaly Burovoy <vitaly(dot)burovoy(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: identity columns
Date: 2017-04-04 17:28:44
Message-ID: 19455.1491326924@sss.pgh.pa.us
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Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> writes:
> On 4/3/17 14:19, Andres Freund wrote:
> + *op->resvalue = Int64GetDatum(nextval_internal(op->d.nextvalueexpr.seqid, false));

>> Is it guaranteed that the caller expects an int64? I saw that
>> nextvalueexpr's have a typeid field.

> It expects one of the integer types. We could cast the result of
> Int64GetDatum() to the appropriate type, but that wouldn't actually do
> anything.

Uh, really? On 32-bit platforms, int64 and int32 datums have entirely
different representations.

regards, tom lane

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