Github user OopsOutOfMemory commented on a diff in the pull request:
https://github.com/apache/spark/pull/6551#discussion_r31798693
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
---
@@ -59,6 +59,42 @@ object HiveTypeCoercion {
}
/**
+ * Implicit promote the DataType 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)
+
+ */
+ val promoteToStringTypeOfTwo: (DataType, DataType) => Option[DataType] =
{
+ case (t1: StringType, t2: DataType) if (t2 != BinaryType && t2 !=
BooleanType) =>
--- End diff --
yes, @cloud-fan
you can refer the chart at the bottom of page in
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Types
This is only for primitive type.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
