From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: setting estate in ExecInitNode() itself |
Date: | 2018-01-05 19:50:27 |
Message-ID: | 20180105195027.3kv64hiipta2tqep@alap3.anarazel.de |
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Lists: | pgsql-hackers |
On 2018-01-05 10:36:19 -0500, Tom Lane wrote:
> Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com> writes:
> > Looking at ExecInitXYZ() functions, we can observe that every such
> > function has a statement like
> > XYZstate->ps.state = estate;
> > where it saves estate in the PlanState.
>
> Yeah ...
>
> > I am wondering why don't we instead save estate in ExecInitNode() itself like
> > result->estate = estate;
>
> That would only work if there were no situation where the field needed to
> be already valid during the node init function. I think that's probably
> wrong already (check ExecInitExpr for instance) and it certainly might
> be wrong in future.
Agreed on that. But I also think there's quite some room for
centralizing some of the work done in the init routines. Not quite sure
how, but I do dislike the amount of repetition both in code and
comments.
Greetings,
Andres Freund
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