Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/12185#discussion_r59122269
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/HyperLogLogPlusPlus.scala
---
@@ -48,6 +46,8 @@ import org.apache.spark.sql.types._
* @param relativeSD the maximum estimation error allowed.
*/
// scalastyle:on
+@ExpressionDescription(
+ usage = "_FUNC_(expr, relativeSD) - Returns the estimated cardinality by
HyperLogLog++.")
--- End diff --
Also provide the usage of `_FUNC_(expr)` (it will mention the default value
of relativeSD). Can we explain relativeSD at here?
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