beliefer commented on code in PR #42398:
URL: https://github.com/apache/spark/pull/42398#discussion_r1369774164
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala:
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@@ -245,3 +249,98 @@ 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]]
Review Comment:
I'm sorry. I get it now. `ListAgg` need save two fields. If so, please go on
the path and push it forward.
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