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Re: Report 2 UBSan bugs found by an automatic tool

From: Bernhard Voelker
Subject: Re: Report 2 UBSan bugs found by an automatic tool
Date: Fri, 30 Jul 2021 12:44:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 7/29/21 10:40 AM, He Jingxuan wrote:
> Any updates on these bugs?

If James agrees, I suggest to remove all of the cost based optimizer code
(which would fix both of the current issues), because:

- CBO violates POSIX regarding strict the left-to-right processing rule.

- Apparently no one ever measured whether this optimization really
  has any benefit, i.e., positive (or negative?) effect on performance.

- CBO code is hard to maintain; ~1200-1500 lines of code could be removed.

- Removing CBO would also solve a couple of other open issue we have in
  our bug tracker.

@James: do you agree?
Maybe we could work together on this ... as you have the better insight.

Have a nice day,

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