Cheng Lian created SPARK-12723:
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Summary: Comprehensive SQL generation support for expressions
Key: SPARK-12723
URL: https://issues.apache.org/jira/browse/SPARK-12723
Project: Spark
Issue Type: Sub-task
Reporter: Cheng Lian
Ensure that all built-in expressions can be mapped to its SQL representation if
there is one (e.g. ScalaUDF doesn't have a SQL representation).
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