Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5616#discussion_r29206970
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ExpectsInputTypes.scala
---
@@ -0,0 +1,13 @@
+package org.apache.spark.sql.catalyst.analysis
+
+import org.apache.spark.sql.types.DataType
+
+/**
+ * For expressions that require a specific `DataType` as input should
implement this trait
+ * so that the proper type conversions can be performed in the analyzer.
+ */
+trait ExpectsInputTypes {
--- End diff --
this should be in expression?
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