Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/9419#discussion_r43833223
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -232,7 +232,7 @@ class Analyzer(
// substitute the group by expressions.
val newGroupByExprs = groupByExprPairs.map(_._2)
--- End diff --
Take this for example:
```sql
select sum(a-b) as ab from mytable group by b with rollup;
```
I think we probably need to add extra column(s) for the output of `Expand`,
(e.g. `(a-b)` in this case). Will that be more simple for this fixing?
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