Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/3964#issuecomment-69522110
The SQL enhanced aggregation syntax may looks like in HiveContext as:
```
GROUP BY expression list WITH ROLLUP
GROUP BY expression list WITH CUBE
GROUP BY expression list, GROUPING SETS (expression list2)
```
See
https://cwiki.apache.org/confluence/display/Hive/Enhanced+Aggregation,+Cube,+Grouping+and+Rollup
Currently in logical analysis and execution, we follows the Hive's
specification, however, in SQL99, it also supports the format like:
```
GROUP BY expression list, GROUPING SETS (expression list2), expression list3
GROUP BY expression list, CUBE(expression list2), expression list3
GROUP BY expression list, ROLLUP(expression list2), expression list3
```
The `grouping column reference list` is optionally required by `CUBE` and
`ROLLUP` (http://savage.net.au/SQL/sql-99.bnf.html) , and there are some
additional work need to be done on the `Logical Node` and `Analyzer` to support
the semantics like for this.
Probably we'd better implement the Hive-Like format first in SQLContext,
what do you think?
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