Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/6551#discussion_r31885774
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
---
@@ -59,6 +59,32 @@ object HiveTypeCoercion {
}
/**
+ * Implicit promote the AtomicType to StringType if
+ * one of the data type in (dt1, dt2) is StringType, and the other is
not either
+ * BooleanType or BinaryType, the TightestCommonType should be StringType
+ * eg: 1. CaseWhenLike case when ... then dt1 else dt2 end
+ * 2. Coalesce(null, dt1, dt2)
+ */
+ private def promoteToStringType(t1: DataType, t2: DataType):
Option[DataType] = (t1, t2) match {
--- End diff --
cc @rxin , [findTightestCommonTypeOfTwo]
(https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala#L44)
is a function and I think we should make them consistent...
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