variable: fix NewSessionVars
#6272
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Set IndexLookupJoinConcurrency to default value. If this value is init as 0, index lookup join will hang forever.
coocood
added
type/bugfix
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LGTM |
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/run-all-tests |
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Set IndexLookupJoinConcurrency to the default value.
If this value is inited as 0, index lookup join will hang forever.
This issue occurs when we upgrade
tidb-serveron an existing cluster, the old cluster doesn't have global variableindex_lookup_join_concurrency, so the 0 value is not overwritten to 4.