Davies Liu created SPARK-14562:
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Summary: Improve constraints propagation in Union
Key: SPARK-14562
URL: https://issues.apache.org/jira/browse/SPARK-14562
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Davies Liu
Assignee: Davies Liu
Currently, Union only takes intersect of the constraints from it's children,
all others are dropped, we should try to merge them together.
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