uros-db commented on code in PR #46597:
URL: https://github.com/apache/spark/pull/46597#discussion_r1605136854
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Mode.scala:
##########
@@ -74,16 +80,28 @@ case class Mode(
if (buffer.isEmpty) {
return null
}
-
+ val collationAwareBuffer =
+ if
(!CollationFactory.fetchCollation(collationId).supportsBinaryEquality) {
+ val modeMap = buffer.toSeq.groupMapReduce {
+ case (key: String, _) =>
+ CollationFactory.getCollationKey(UTF8String.fromString(key),
collationId)
+ case (key: UTF8String, _) =>
+ CollationFactory.getCollationKey(key, collationId)
+ case (key, _) => key
+ }(x => x)((x, y) => (x._1, x._2 + y._2)).values
+ modeMap
+ } else {
+ buffer
+ }
Review Comment:
```suggestion
val collationAwareBuffer = child.dataType match {
case st: StringType =>
val modeMap = buffer.toSeq.groupMapReduce {
case (key: String, _) =>
CollationFactory.getCollationKey(UTF8String.fromString(key),
collationId)
case (key: UTF8String, _) =>
CollationFactory.getCollationKey(key, collationId)
case (key, _) => key
}(x => x)((x, y) => (x._1, x._2 + y._2)).values
modeMap
case _ => buffer
}
```
(something like this)
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