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[SPARK-17107][SQL] Remove redundant pushdown rule for Union
## What changes were proposed in this pull request? The `Optimizer` rules `PushThroughSetOperations` and `PushDownPredicate` have a redundant rule to push down `Filter` through `Union`. We should remove it. ## How was this patch tested? Jenkins tests. Author: Liang-Chi Hsieh <simonh@tw.ibm.com> Closes #14687 from viirya/remove-extra-pushdown.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala 5 additions, 16 deletions...a/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/SetOperationSuite.scala 2 additions, 1 deletion...ache/spark/sql/catalyst/optimizer/SetOperationSuite.scala
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