LuciferYang commented on code in PR #41718:
URL: https://github.com/apache/spark/pull/41718#discussion_r1243571413
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sql/core/src/main/scala/org/apache/spark/sql/functions.scala:
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@@ -368,6 +368,23 @@ object functions {
*/
def collect_set(columnName: String): Column = collect_set(Column(columnName))
+ /**
+ * Returns a count-min sketch of a column with the given esp, confidence and
seed. The result
+ * is an array of bytes, which can be deserialized to a `CountMinSketch`
before usage.
+ * Count-min sketch is a probabilistic data structure used for cardinality
estimation using
+ * sub-linear space.
+ *
+ * @group agg_funcs
+ * @since 3.5.0
+ */
+ def count_min_sketch(
Review Comment:
What's the difference between this one and
`DataFrameStatFunctions#countMinSketch`?
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