Wenchen Fan created SPARK-30893:
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Summary: expressions should not change its data type/nullability
after it's created
Key: SPARK-30893
URL: https://issues.apache.org/jira/browse/SPARK-30893
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.0
Reporter: Wenchen Fan
This is a problem because the configuration can change between different phases
of planning, and this can silently break a query plan which can lead to crashes
or data corruption.
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