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https://issues.apache.org/jira/browse/SPARK-17868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-17868:
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    Assignee:     (was: Apache Spark)

> 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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