Takeshi Yamamuro created SPARK-26747:
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Summary: Makes GetMapValue nullability more precise
Key: SPARK-26747
URL: https://issues.apache.org/jira/browse/SPARK-26747
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.0.0
Reporter: Takeshi Yamamuro
In master, GetMapValue nullable is always true;
https://github.com/apache/spark/blob/cf133e611020ed178f90358464a1b88cdd9b7889/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeExtractors.scala#L371
But, If input key is foldable, we could make its nullability more precise.
This fix is the same with SPARK-26637.
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