Details
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Improvement
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Status: Open
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Major
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Resolution: Unresolved
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1.15.0
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None
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None
Description
When the probe-side data for a hash join is skewed, it is preferable to have the corresponding partition on the build side to be in memory.
Currently, with the spill-to-disk feature, the partition selected for spilling to disk is done at random. This means that a highly skewed probe-side data would also spill for lack of a corresponding hash table partition in memory.
Attachments
Issue Links
- is related to
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DRILL-6444 Hash Join: Avoid partitioning when memory is sufficient
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- Open
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