Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21713#discussion_r200281741
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -166,6 +166,30 @@ object TypeCoercion {
case (l, r) => None
}
+ private def mergeComplexTypes(
+ t1: DataType,
+ t2: DataType,
--- End diff --
Maybe `findTightestCommonType` can also reuse `mergeComplexTypes` ?
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