Github user viirya commented on the issue:
https://github.com/apache/spark/pull/17491
I think the current approach will have a LeftSemi join for this Exists
subquery. Is it far from the optimal access plan you said?
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Github user nsyca commented on the issue:
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@cloud-fan wrote: "How useful is this optimization? It only works when
Exists has no condition, is that a common case?"
One of the common cases of this usage is an application of ACL where
Github user cloud-fan commented on the issue:
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LGTM, merging to master!
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Github user viirya commented on the issue:
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@cloud-fan The optimization rule is removed now. This patch now is just
making `Exists` subquery without correlated references work. Please take a look
again. Thanks.
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Github user viirya commented on the issue:
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retest this please.
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cc @cloud-fan
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