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

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planner: log the reason why the sample-rate is chosen when analyzing table#45936
#45938
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affects-7.1This bug affects the 7.1.x(LTS) versions.sig/plannerSIG: Plannertype/enhancementThe issue or PR belongs to an enhancement.
@qw4990

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@qw4990
qw4990
opened on 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:
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    affects-7.1This bug affects the 7.1.x(LTS) versions.sig/plannerSIG: Plannertype/enhancementThe issue or PR belongs to an enhancement.

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