Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21054#discussion_r187751801
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -775,6 +775,178 @@ object functions {
*/
def var_pop(columnName: String): Column = var_pop(Column(columnName))
+ /**
+ * Aggregate function: returns the number of non-null pairs.
+ *
+ * @group agg_funcs
+ * @since 2.4.0
+ */
+ def regr_count(y: Column, x: Column): Column = withAggregateFunction {
--- End diff --
do we need all of these? seems like users can just invoke expr to do them.
this file is getting very long.
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