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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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Herman van Hovell resolved SPARK-17868.
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Resolution: Fixed
Assignee: Jiang Xingbo
Fix Version/s: 2.2.0
> 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
> Assignee: Jiang Xingbo
> Fix For: 2.2.0
>
>
> 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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