Cheng Hao created SPARK-8653:
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Summary: Add constraint for Children expression for data type
Key: SPARK-8653
URL: https://issues.apache.org/jira/browse/SPARK-8653
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Cheng Hao
Currently, we have trait in Expression like `ExpectsInputTypes` and also the
`checkInputDataTypes`, but can not convert the children expressions
automatically, except we write the new rules in the `HiveTypeCoercion`.
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