Liang-Chi Hsieh created SPARK-18002:

             Summary: Prune unnecessary IsNotNull predicates from Filter
                 Key: SPARK-18002
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Liang-Chi Hsieh

In PruneFilters rule, we can prune unnecessary IsNotNull predicates if the 
predicate in IsNotNull is not nullable.

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