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planner: log the reason why the sample-rate is chosen when analyzing table #45936

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qw4990 opened this issue Aug 9, 2023 · 0 comments · Fixed by #45938
Closed

planner: log the reason why the sample-rate is chosen when analyzing table #45936

qw4990 opened this issue Aug 9, 2023 · 0 comments · Fixed by #45938
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affects-7.1 sig/planner SIG: Planner type/enhancement The issue or PR belongs to an enhancement.

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@qw4990
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qw4990 commented Aug 9, 2023

Enhancement

The optimizer chose the wrong sample rate to analyze a big table and then caused TiDB OOM, but now we cannot know why this wrong sample rate is chosen from the log.
It's better to log the reason why the sample rate is chosen for this table when analyzing:
image

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Labels
affects-7.1 sig/planner SIG: Planner type/enhancement The issue or PR belongs to an enhancement.
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