stefankandic commented on code in PR #48585:
URL: https://github.com/apache/spark/pull/48585#discussion_r1812157798
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala:
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@@ -335,12 +343,30 @@ abstract class TypeCoercionBase {
// Return the result after the widen data types have been found for all
the children
if (attrIndex >= children.head.output.length) return castedTypes.toSeq
- // For the attrIndex-th attribute, find the widest type
- val widenTypeOpt =
findWiderCommonType(children.map(_.output(attrIndex).dataType))
- castedTypes.enqueue(widenTypeOpt)
+ val outputType = findOutputType(children, attrIndex)
+ castedTypes.enqueue(outputType)
getWidestTypes(children, attrIndex + 1, castedTypes)
}
+ /** Given children of the operator, determines the output type of the
+ * `attrIndex`-th attribute
+ */
+ private def findOutputType(children: Seq[LogicalPlan], attrIndex: Int):
Option[DataType] = {
Review Comment:
You cannot catch this in `CollationTypeCasts` or any type coercion rule for
that matter, since they only operate on individual expressions, and here the
projects are spread across different subqueries
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