EnricoMi commented on code in PR #36150:
URL: https://github.com/apache/spark/pull/36150#discussion_r892374424
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala:
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@@ -736,6 +737,24 @@ abstract class TypeCoercionBase {
}
}
+ /**
+ * Determines the value type of a [[Melt]].
+ */
+ object MeltCoercion extends Rule[LogicalPlan] {
+ override def apply(plan: LogicalPlan): LogicalPlan =
+ plan resolveOperators {
+ case m: Melt if m.values.nonEmpty && m.values.forall(_.resolved) &&
m.valueType.isEmpty =>
Review Comment:
I think `m.values.forall(_.resolved)` is still needed, otherwise `if
m.values.nonEmpty && !haveSameType(m.values.map(_.dataType))` could call this
rule when `values` are not resolved and `m.values.map(_.dataType)` would throw
an exception.
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