Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21074#discussion_r181620108
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -178,7 +178,13 @@ object TypeCoercion {
private def findWiderCommonType(types: Seq[DataType]): Option[DataType]
= {
types.foldLeft[Option[DataType]](Some(NullType))((r, c) => r match {
case Some(d) => findWiderTypeForTwo(d, c)
- case None => None
+ // Currently we find the wider common type by comparing the two
types from left to right,
--- End diff --
This is a behavior change. We need to make it configurable. Add a conf and
update the migration guide.
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