Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15090#discussion_r81102672
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
@@ -581,6 +581,13 @@ object SQLConf {
.timeConf(TimeUnit.MILLISECONDS)
.createWithDefault(10L)
+ val NDV_MAX_ERROR =
+ SQLConfigBuilder("spark.sql.statistics.ndv.maxError")
+ .internal()
+ .doc("The maximum estimation error allowed in HyperLogLog++
algorithm.")
--- End diff --
should we mention that this conf is only used to generate column level
statistics?
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