Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21054#discussion_r187761743
--- 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 --
@rxin, how about splitting up this file by the group or something, or
deprecating all the functions that can be called via expr for 3.0.0? To me, it
looked a bit odd when some functions exist and some did not. It was an actual
use case and I had to check which function exists or not every time.
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