Kent Yao created SPARK-31225:
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Summary: Override `sql` method for OuterReference
Key: SPARK-31225
URL: https://issues.apache.org/jira/browse/SPARK-31225
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.1.0
Reporter: Kent Yao
OuterReference is LeafExpression, so it's children is Nil, which makes its SQL
representation always be outer(). This makes our explain-command and error msg
unclear when OuterReference exists
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