Hisoka-X commented on code in PR #42398:
URL: https://github.com/apache/spark/pull/42398#discussion_r1369934056
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala:
##########
@@ -245,3 +249,117 @@ case class CollectTopK(
override def withNewInputAggBufferOffset(newInputAggBufferOffset: Int):
CollectTopK =
copy(inputAggBufferOffset = newInputAggBufferOffset)
}
+
+@ExpressionDescription(
+ usage = "_FUNC_(expr) - Returns the concatenated input values," +
+ " separated by the delimiter string.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(col) FROM VALUES ('a'), ('b'), ('c') AS tab(col);
+ a,b,c
+ > SELECT _FUNC_(col) FROM VALUES (NULL), ('a'), ('b') AS tab(col);
+ a,b
+ > SELECT _FUNC_(col) FROM VALUES ('a'), ('a') AS tab(col);
+ a,a
+ > SELECT _FUNC_(DISTINCT col) FROM VALUES ('a'), ('a'), ('b') AS
tab(col);
+ a,b
+ > SELECT _FUNC_(col, '|') FROM VALUES ('a'), ('b') AS tab(col);
+ a|b
+ > SELECT _FUNC_(col) FROM VALUES (NULL), (NULL) AS tab(col);
+
+ """,
+ group = "agg_funcs",
+ since = "4.0.0")
+case class ListAgg(
+ child: Expression,
+ delimiter: Expression = Literal.create(",", StringType),
+ orderExpression: Expression,
+ reverse: Boolean = false,
+ mutableAggBufferOffset: Int = 0,
+ inputAggBufferOffset: Int = 0) extends Collect[mutable.ArrayBuffer[Any]]
+ with BinaryLike[Expression] {
+
+ def this(child: Expression) =
+ this(child, Literal.create(",", StringType), child, false, 0, 0)
+ def this(child: Expression, delimiter: Expression) =
+ this(child, delimiter, child, false, 0, 0)
+
+ private lazy val sameExpression = orderExpression.semanticEquals(child)
+
+ override protected def convertToBufferElement(value: Any): Any =
InternalRow.copyValue(value)
+ override def defaultResult: Option[Literal] = Option(Literal.create("",
StringType))
+
+ override protected lazy val bufferElementType: DataType = {
+ if (sameExpression) {
+ child.dataType
+ } else {
+ StructType(Seq(
+ StructField("value", child.dataType),
+ StructField("sortOrder", orderExpression.dataType)))
+ }
+ }
+
+ override def eval(buffer: mutable.ArrayBuffer[Any]): Any = {
+ if (buffer.nonEmpty) {
+ val ordering = PhysicalDataType.ordering(orderExpression.dataType)
+ val sorted = if (sameExpression) {
+ if (reverse) {
+ buffer.toSeq.sorted(ordering.reverse)
+ } else {
+ buffer.toSeq.sorted(ordering)
+ }
+ } else {
+ if (reverse) {
+
buffer.asInstanceOf[mutable.ArrayBuffer[InternalRow]].toSeq.sortBy(_.get(1,
+
orderExpression.dataType))(ordering.asInstanceOf[Ordering[AnyRef]].reverse).map(_.get(0,
+ child.dataType))
+ } else {
+
buffer.asInstanceOf[mutable.ArrayBuffer[InternalRow]].toSeq.sortBy(_.get(1,
+
orderExpression.dataType))(ordering.asInstanceOf[Ordering[AnyRef]]).map(_.get(0,
+ child.dataType))
+ }
+ }
+ UTF8String.fromString(sorted.map(_.toString)
+ .mkString(delimiter.eval().asInstanceOf[UTF8String].toString))
+ } else {
+ UTF8String.fromString("")
+ }
+ }
+
+ override def update(buffer: ArrayBuffer[Any], input: InternalRow):
ArrayBuffer[Any] = {
+ val value = child.eval(input)
+ if (value != null) {
+ val v = if (sameExpression) {
+ convertToBufferElement(value)
+ } else {
+ InternalRow.apply(convertToBufferElement(value),
+ convertToBufferElement(orderExpression.eval(input)))
+ }
+ buffer += v
+ }
+ buffer
+ }
+
+ override def createAggregationBuffer(): mutable.ArrayBuffer[Any] =
mutable.ArrayBuffer.empty
+
+ override def withNewMutableAggBufferOffset(
+ newMutableAggBufferOffset: Int) : ImperativeAggregate =
+ copy(mutableAggBufferOffset = newMutableAggBufferOffset)
+
+ override def withNewInputAggBufferOffset(newInputAggBufferOffset: Int):
ImperativeAggregate =
+ copy(inputAggBufferOffset = newInputAggBufferOffset)
+
+ override def nullable: Boolean = false
+
+ override def dataType: DataType = StringType
+
+ override def left: Expression = child
+
+ override def right: Expression = orderExpression
Review Comment:
addressed all.
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