Gengliang Wang created SPARK-21848:
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Summary: Create trait to identify user-defined functions
Key: SPARK-21848
URL: https://issues.apache.org/jira/browse/SPARK-21848
Project: Spark
Issue Type: Task
Components: SQL
Affects Versions: 2.2.0
Reporter: Gengliang Wang
Priority: Minor
Create a trait to make it easier for identifying what expressions are
user-defined functions
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