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Re: Report 2 UBSan bugs found by an automatic tool
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From: |
Bernhard Voelker |
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Subject: |
Re: Report 2 UBSan bugs found by an automatic tool |
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Date: |
Fri, 30 Jul 2021 12:44:24 +0200 |
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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,
Berny