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Sathiya Kumar commented on SPARK-22181:
---------------------------------------

Please give me assign right to assign this task to myself, thank you.

> 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: 2.1.1, 2.2.0
>            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.
> ![Case-1](https://github.com/sathiyapk/Blog-Posts/blob/master/images/spark-optimizer/ReplaceExceptWithNotFilter-case1.png)
> ![Case-2](https://github.com/sathiyapk/Blog-Posts/blob/master/images/spark-optimizer/ReplaceExceptWithNotFilter-case2.png)



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