Avoid adding unnecessary exchanges under Window nodes #177
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Extracted-From: https://github.com/prestodb/presto with some stylistic changes.
Extracted-From: https://github.com/prestodb.presto with some stylistic changes
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
dain
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rice668
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rice668
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