Github user hvanhovell commented on a diff in the pull request: https://github.com/apache/spark/pull/15484#discussion_r84003737 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -229,10 +235,17 @@ class Analyzer( * Group Count: 2 ^ N (N is the number of group expressions) * * We need to get all of its subsets for a given GROUPBY expression, the subsets are - * represented as the bit masks. + * represented as sequence of expressions. */ - def bitmasks(c: Cube): Seq[Int] = { - Seq.tabulate(1 << c.groupByExprs.length)(i => i) + def selectGroupExprsCube(exprs: Seq[Expression]): Seq[Seq[Expression]] = { + if (exprs.length == 0) { + Seq(Seq.empty[Expression]) + } else { + val expandExprsList = selectGroupExprsCube(exprs.drop(1)) + expandExprsList.map { expandExprs => + exprs.take(1) ++ expandExprs --- End diff -- For future reference: exprs.take(1) ->exprs.head
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