Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/15484#discussion_r86075252 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala --- @@ -216,10 +216,16 @@ class Analyzer( * Group Count: N + 1 (N is the number of group expressions) * * We need to get all of its subsets for the rule described above, the subset is - * represented as the bit masks. + * represented as sequence of expressions. */ - def bitmasks(r: Rollup): Seq[Int] = { - Seq.tabulate(r.groupByExprs.length + 1)(idx => (1 << idx) - 1) + def rollupExprs(exprs: Seq[Expression]): Seq[Seq[Expression]] = { + val buffer = ArrayBuffer.empty[Seq[Expression]] --- End diff -- Is this just `exprs.inits` ? to be honest this is the first time I've seen the use of init/inits on a trait.
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