Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18853#discussion_r143598538
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -412,7 +480,66 @@ object TypeCoercion {
val commonTypes = lhs.zip(rhs).flatMap { case (l, r) =>
findCommonTypeForBinaryComparison(l.dataType, r.dataType)
+ .orElse(findTightestCommonType(l.dataType, r.dataType))
--- End diff --
Could you still try to avoid duplicating the codes?
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