Liang-Chi Hsieh created SPARK-14191:
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Summary: Fix Expand operator constraints
Key: SPARK-14191
URL: https://issues.apache.org/jira/browse/SPARK-14191
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Liang-Chi Hsieh
Expand operator now uses its child plan's constraints as its valid constraints
(i.e., the base of constraints). This is not correct because Expand will set
its group by attributes to null values. So the nullability of these attributes
should be true.
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