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small cached table doesn't support index merge #29682
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type/enhancement
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tiancaiamao
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Nov 11, 2021
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I think the IndexMerge works well with small cached table now. And IndexMerge already supported UnionScan by #29875, so close this issue.
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Enhancement
While developing, I found this #29443 (comment), thanks to @lcwangchao for pointing it out.
and seaching the issues list, there is a known issue #28494 here
So small cached table doesn't support index merge
This limitation is imposed by the fact union scan doesn't support index merge...
small cached table implemetation depends on union scan, so it gets the same limitation.
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