GideonPotok commented on code in PR #47154:
URL: https://github.com/apache/spark/pull/47154#discussion_r1709917290
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Mode.scala:
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@@ -86,6 +88,57 @@ case class Mode(
buffer
}
+ private def getCollationAwareBuffer(
+ childDataType: DataType,
+ buffer: OpenHashMap[AnyRef, Long]): Iterable[(AnyRef, Long)] = {
+ def getBuffer(groupingFunction: AnyRef => _): Iterable[(AnyRef, Long)] = {
+ buffer.groupMapReduce(t =>
+ groupingFunction(t._1))(x => x)((x, y) => (x._1, x._2 + y._2)).values
+ }
+ def getMyBuffer(
+ childDataType: DataType): Option[AnyRef => _] = {
+ childDataType match {
+ case _ if UnsafeRowUtils.isBinaryStable(child.dataType) => None
+ case _ => Some(f(_, childDataType))
+ }
+ }
+ getMyBuffer(childDataType).map(getBuffer).getOrElse(buffer)
+ }
+
+ private def f(myData: AnyRef, myElementType: DataType): AnyRef = {
+ if (UnsafeRowUtils.isBinaryStable(myElementType)) {
+ // Short-circuit if there is no collation.
+ myData
+ } else if (myElementType.isInstanceOf[StructType]) {
+ recursivelyGetBufferForStructType(
+ myData.asInstanceOf[InternalRow].toSeq(
+ myElementType.asInstanceOf[StructType]).zip(
+ myElementType.asInstanceOf[StructType].fields))
+ } else if (myElementType.isInstanceOf[ArrayType]) {
+ recursivelyGetBufferForArrayType(
+ myElementType.asInstanceOf[ArrayType],
+ myData.asInstanceOf[ArrayData])
+ } else if (myElementType.isInstanceOf[StringType]) {
+ CollationFactory.getCollationKey(
+ myData.asInstanceOf[UTF8String],
+ myElementType.asInstanceOf[StringType].collationId)
+ } else {
+ throw new UnsupportedOperationException(
+ s"Unsupported data type for collation-aware mode: $myElementType")
+ }
+ }
+
+ private def recursivelyGetBufferForStructType(
+ tuples: Seq[(Any, StructField)]): Seq[Any] = {
+ tuples.map(t => f(t._1.asInstanceOf[AnyRef], t._2.dataType))
+ }
+
+ private def recursivelyGetBufferForArrayType(
+ a: ArrayType,
+ data: ArrayData): Seq[Any] = {
+ (0 until data.numElements()).map(i => f(data.get(i, a.elementType),
a.elementType))
+ }
+
Review Comment:
As a follow up is best.
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