Apache Spark commented on SPARK-17868:

User 'jiangxb1987' has created a pull request for this issue:

> Do not use bitmasks during parsing and analysis of CUBE/ROLLUP/GROUPING SETS
> ----------------------------------------------------------------------------
>                 Key: SPARK-17868
>                 URL: https://issues.apache.org/jira/browse/SPARK-17868
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Herman van Hovell
> We generate bitmasks for grouping sets during the parsing process, and use 
> these during analysis. These bitmasks are difficult to work with in practice 
> and have lead to numerous bugs. I suggest that we remove these and use actual 
> sets instead, however we would need to generate these offsets for the 
> grouping_id.

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