Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5842#discussion_r29635785
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/stat/StatFunctions.scala
---
@@ -95,4 +97,28 @@ private[sql] object StatFunctions {
val counts = collectStatisticalData(df, cols)
counts.cov
}
+
+ /** Generate a table of frequencies for the elements of two columns. */
+ private[sql] def crossTabulate(df: DataFrame, col1: String, col2:
String): DataFrame = {
+ val tableName = s"${col1}_$col2"
+ val counts = df.groupBy(col1, col2).agg(col(col1), col(col2),
count("*")).take(1e8.toInt)
--- End diff --
@brkyvz can you submit a follow up pr to reduce 1e8 to 1e6? 1e8 is too
large.
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