Github user thunterdb commented on a diff in the pull request:
https://github.com/apache/spark/pull/6042#discussion_r53821676
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataFrameStatFunctions.scala ---
@@ -37,6 +37,16 @@ import org.apache.spark.util.sketch.{BloomFilter,
CountMinSketch}
final class DataFrameStatFunctions private[sql](df: DataFrame) {
/**
+ * Calculate the approximate quantile of numerical column of a DataFrame.
+ * @param col the name of the column
+ * @param quantile the quantile number
+ * @return the approximate quantile
--- End diff --
Done
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