Takuya Ueshin created SPARK-2509:
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Summary: Add optimization for Substring.
Key: SPARK-2509
URL: https://issues.apache.org/jira/browse/SPARK-2509
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Takuya Ueshin
{{Substring}} including {{null}} literal cases could be added to
{{NullPropagation}}.
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