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Skip collecting statistics for some wide column types such as JSON/TEXT/BLOB #44725

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xuyifangreeneyes opened this issue Jun 16, 2023 · 0 comments · Fixed by #44653
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Skip collecting statistics for some wide column types such as JSON/TEXT/BLOB #44725

xuyifangreeneyes opened this issue Jun 16, 2023 · 0 comments · Fixed by #44653
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component/statistics sig/planner SIG: Planner type/enhancement The issue or PR belongs to an enhancement.

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@xuyifangreeneyes
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Enhancement

Currenly, analyze would collect about 11000 samples into TiDB memory. If the table has some wide column types such JSON/TEXT/BLOB, the samples can take up much memory and even lead to OOM. However, the statistics collected for JSON/BLOB are not very important since the optimizer rarely use them. Hence, we hope to skip collecting statistics for some wide column types such as JSON/TEXT/BLOB.
@xuyifangreeneyes xuyifangreeneyes added type/enhancement The issue or PR belongs to an enhancement. sig/planner SIG: Planner component/statistics labels Jun 16, 2023
@xuyifangreeneyes xuyifangreeneyes mentioned this issue Jun 16, 2023
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ti-chi-bot bot pushed a commit that referenced this issue Jun 19, 2023
@xuyifangreeneyes
planner, sessionctx: skip wide type columns such as JSON when collect…
397062f 
…ing statistics (#44653)

close #44725
@ti-chi-bot ti-chi-bot mentioned this issue Jun 21, 2023
Merged
12 tasks
ti-chi-bot bot pushed a commit that referenced this issue Jun 21, 2023
@ti-chi-bot
planner, sessionctx: skip wide type columns such as JSON when collect…
bf1ac37 
…ing statistics (#44653) (#44854)

close #44725
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component/statistics sig/planner SIG: Planner type/enhancement The issue or PR belongs to an enhancement.
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