Github user watermen commented on the pull request:
https://github.com/apache/spark/pull/5045#issuecomment-82056296
@yhuai This patch supports two syntaxs. One is also supported by
HiveContext.
```
GROUP BY expression list WITH ROLLUP
GROUP BY expression list WITH CUBE
GROUP BY expression list GROUPING SETS(expression list2)
```
and the other is subset of SQL99
```
GROUP BY ROLLUP(expression list)
GROUP BY CUBE(expression list)
GROUP BY GROUPING SETS(expression list)
```
I want to compat SQL99 in this patch.
You mean we just start with one syntax(supported by HiveContext), and then
compat other syntaxs?
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