Yin Huai created SPARK-9372:
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Summary: For a join operator, rows with null equal join key
expression can be filtered out early
Key: SPARK-9372
URL: https://issues.apache.org/jira/browse/SPARK-9372
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Yin Huai
Assignee: Yin Huai
Taking {{select ... from A join B on (A.key = B.key)}} as an example, we can
filter out rows that have null values for column A.key/B.key because those rows
do not contribute to the result of the output.
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