Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/15484#discussion_r84003200
--- 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]]
= {
--- End diff --
We could make this one more concise:
```scala
def cubeExprs(exprs: Seq[String]): Seq[Seq[String]] = exprs match {
case x :: xs =>
val initial = cubeExprs(xs)
initial.map(x +: _) ++ initial
case Nil =>
Seq(Seq.empty)
}
```
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