Re: Reducing duplicativeness of EquivalenceClass-derived clauses

From: Zhang Mingli <zmlpostgres(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)lists(dot)postgresql(dot)org
Subject: Re: Reducing duplicativeness of EquivalenceClass-derived clauses
Date: 2022-10-27 13:37:04
Message-ID: d3b254ff-adc1-4264-a9f3-c40be30d53eb@Spark
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Hi,

On Oct 27, 2022, 21:29 +0800, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, wrote:
> Zhang Mingli <zmlpostgres(at)gmail(dot)com> writes:
> > How about combine ec->ec_sources and ec->derives as one list for less codes?
>
> Keeping them separate is required for the broken-EC code paths.
> Even if it weren't, I wouldn't merge them just to save a couple
> of lines of code --- I think it's useful to be able to tell which
> clauses the EC started from.
>
> regards, tom lane
Got it, thanks.

Regards,
Zhang Mingli

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