Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18853#discussion_r155366222
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -148,6 +159,25 @@ object TypeCoercion {
case (l, r) => None
}
+ val findCommonTypeToCompatibleWithHive: (DataType, DataType) =>
Option[DataType] = {
+ // Follow hive's binary comparison action:
+ //
https://github.com/apache/hive/blob/rel/storage-release-2.4.0/ql/src/java/
+ // org/apache/hadoop/hive/ql/exec/FunctionRegistry.java#L781
--- End diff --
I saw the change history of this file. It sounds like Hive's type coercion
rules are also evolving.
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