Dongjoon Hyun created SPARK-16174:
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Summary: Add RemoveLiteralRepetitionFromIn optimizer
Key: SPARK-16174
URL: https://issues.apache.org/jira/browse/SPARK-16174
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Dongjoon Hyun
Priority: Minor
This issue adds an optimizer to remove the duplicated literals from SQL `IN`
predicates. This optimizer prevents user mistakes and also can optimize some
queries like
[TPCDS-36|https://github.com/apache/spark/blob/master/sql/core/src/test/resources/tpcds/q36.sql#L19].
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