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Avoid adding unnecessary exchanges under Window nodes #177

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merged 4 commits into from Feb 7, 2019

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martint commented Feb 6, 2019

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martint added some commits Feb 6, 2019

Avoid adding unnecessary exchanges under Window nodes
If the subplan is already node-partitioned on a subset of the window
function partitioning columns, the partitioning requirements are satisfied
and a reshuffling exchange is unnecessary.

Extracted-From: https://github.com/prestodb/presto

@cla-bot cla-bot bot added the cla-signed label Feb 6, 2019

@dain

dain approved these changes Feb 7, 2019

@martint martint merged commit 839ffbe into prestosql:master Feb 7, 2019

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@electrum electrum added this to the 303 milestone Feb 13, 2019

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