reference/performance: specify index name of primary key for USE_INDEX_MERGE (#2350)#2640
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…X_MERGE (pingcap#2350) Co-authored-by: Keke Yi <40977455+yikeke@users.noreply.github.com>
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Apr 7, 2020
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cherry-pick #2350 to release-4.0
What is changed, added or deleted?
Add a notice to inform the index name of primary key for
USE_INDEX_MERGEhint.Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
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