beliefer commented on code in PR #42398:
URL: https://github.com/apache/spark/pull/42398#discussion_r1368419550
##########
sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4:
##########
@@ -988,6 +988,8 @@ primaryExpression
| name=(PERCENTILE_CONT | PERCENTILE_DISC) LEFT_PAREN
percentage=valueExpression RIGHT_PAREN
WITHIN GROUP LEFT_PAREN ORDER BY sortItem RIGHT_PAREN
(FILTER LEFT_PAREN WHERE where=booleanExpression RIGHT_PAREN)? ( OVER
windowSpec)? #percentile
+ | LISTAGG LEFT_PAREN setQuantifier? aggEpxr=expression (COMMA
delimiter=stringLit)? RIGHT_PAREN
+ WITHIN GROUP LEFT_PAREN ORDER BY sortItem RIGHT_PAREN (OVER
windowSpec)? #listAgg
Review Comment:
```suggestion
WITHIN GROUP LEFT_PAREN ORDER BY sortItem RIGHT_PAREN (OVER
windowSpec)? #listAgg
```
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala:
##########
@@ -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:
Proxy mode can also be used.
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala:
##########
@@ -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 think we should avoid change `Collect`. We can declare a field of
`CollectList` and `ListAgg` extended `BinaryLike[Expression]`
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