[405] Eliminate data skew in hash shuffle #406
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Can one of the admins verify this patch? |
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test this please |
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test this please |
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Changelog category (leave one):
Since
cityHash64will be null if any argument is null, this could cause data skew. Remove the codes for marking null rows to belong to partition 0, we still keep the result correct.Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
...
Documentation entry for user-facing changes
close #405