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https://issues.apache.org/jira/browse/SPARK-8653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14609579#comment-14609579
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Davies Liu commented on SPARK-8653:
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[~rxin] With the new `ExpectsInputTypes`, we still need a way to tell how to do
the conversion, it's ugly to do the type switch in eval() or codegen().
Maybe we could improve `AutoCastInputType` to have a method `acceptedTypes`,
which returns a list of list of data types, specify those types could be casted
into expected types. Be default, it will accept all type types which could be
casted to expected types.
> 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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