panbingkun commented on code in PR #41718:
URL: https://github.com/apache/spark/pull/41718#discussion_r1241464167
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sql/core/src/main/scala/org/apache/spark/sql/functions.scala:
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@@ -368,6 +368,24 @@ object functions {
*/
def collect_set(columnName: String): Column = collect_set(Column(columnName))
+ /**
Review Comment:
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.
Is the comment above more aligned?
https://github.com/apache/spark/blob/00e7c08606d0b6de22604d2a7350ea0711355300/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CountMinSketchAgg.scala#L45-L48
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