Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19977#discussion_r157899407
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -564,6 +565,16 @@ object TypeCoercion {
NaNvl(Cast(l, DoubleType), r)
case NaNvl(l, r) if r.dataType == NullType => NaNvl(l, Cast(r,
l.dataType))
}
+ // This group needs to be transformed in a post order
+ .transformExpressionsUp {
+ // When all inputs in [[Concat]] are binary, coerces an output type
to binary
+ case c @ Concat(children, _)
--- End diff --
Create a new `TypeCoercion ` rule for it?
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