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Add more log and information about why index merge is not used #30824

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guo-shaoge opened this issue Dec 17, 2021 · 1 comment
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Add more log and information about why index merge is not used #30824

guo-shaoge opened this issue Dec 17, 2021 · 1 comment
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type/enhancement The issue or PR belongs to an enhancement.

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Enhancement

There are many reasons that makes index merge is inapplicable, we should add more information to indicates why. Also this information should be write to log.

tidb/planner/core/stats.go

Line 433 in a6fc5c6

ds.ctx.GetSessionVars().StmtCtx.AppendWarning(errors.Errorf("IndexMerge is inapplicable or disabled"))

@guo-shaoge guo-shaoge added the type/enhancement The issue or PR belongs to an enhancement. label Dec 17, 2021
@guo-shaoge guo-shaoge self-assigned this Dec 17, 2021
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fixed in #30341

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