Sathiya Kumar created SPARK-22181:
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Summary: ReplaceExceptWithNotFilter if one or both of the datasets
are fully derived out of Filters from a same parent
Key: SPARK-22181
URL: https://issues.apache.org/jira/browse/SPARK-22181
Project: Spark
Issue Type: New Feature
Components: Optimizer, SQL
Affects Versions: 2.2.0, 2.1.1
Reporter: Sathiya Kumar
Priority: Minor
While applying Except operator between two datasets, if one or both of the
datasets are purely transformed using filter operations, then instead of
rewriting the Except operator using expensive join operation, we can rewrite it
using filter operation by flipping the filter condition of the right node.
!https://github.com/sathiyapk/Blog-Posts/blob/master/images/spark-optimizer/ReplaceExceptWithNotFilter-case1.png!
!https://github.com/sathiyapk/Blog-Posts/blob/master/images/spark-optimizer/ReplaceExceptWithNotFilter-case2.png!
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