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[SPARK-36194][SQL][FOLLOWUP] Propagate distinct keys more precisely - #36100
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cloud-fan wants to merge 1 commit into
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[SPARK-36194][SQL][FOLLOWUP] Propagate distinct keys more precisely#36100cloud-fan wants to merge 1 commit into
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cloud-fan
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Apr 7, 2022
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### What changes were proposed in this pull request? This PR is a followup of #35779 , to propagate distinct keys more precisely in 2 cases: 1. For `LIMIT 1`, each output attribute is a distinct key, not the entire tuple. 2. For aggregate, we can still propagate distinct keys from child. ### Why are the changes needed? make the optimization cover more cases ### Does this PR introduce _any_ user-facing change? no ### How was this patch tested? new tests Closes#36100 from cloud-fan/followup. Authored-by: Wenchen Fan <wenchen@databricks.com> Signed-off-by: Yuming Wang <yumwang@ebay.com> (cherry picked from commit fbe82fb) Signed-off-by: Yuming Wang <yumwang@ebay.com>
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Apr 8, 2022
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Merged to master and branch-3.3. |
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What changes were proposed in this pull request?
This PR is a followup of #35779 , to propagate distinct keys more precisely in 2 cases:
LIMIT 1, each output attribute is a distinct key, not the entire tuple.Why are the changes needed?
make the optimization cover more cases
Does this PR introduce any user-facing change?
no
How was this patch tested?
new tests