Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7606#discussion_r35293172
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -761,6 +761,14 @@ object functions {
*/
def bitwiseNOT(e: Column): Column = BitwiseNot(e.expr)
+ /**
+ * Parses the comma separated expression strings into the columns they
represent, similar to
+ * DataFrame.selectExpr
+ *
--- End diff --
it'd be great to give an example in the function here, since this is a
somewhat unique function. maybe give an example with groupby?
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