Details
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Type:
Bug
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Status: Closed
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: None
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Fix Version/s: 1.0.0-incubating
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Component/s: None
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Labels:None
Description
Support grouping sets in the relational algebra. This feature would add a new field, groupKeys, to aggregate rel that has a set of bit maps, each of which has a grouping key.
For example, if 'group by x, y, z' is represented by
AggregateRel(groupSet={0, 1, 2})
then 'group by grouping sets (x, y, z), (y, z), ()' would be represented by
AggregateRel(groupSet={0, 1, 2}, groupSets=[ {0, 1, 2}, {1, 2}, {} ])
A regular group by, or a group by with a singleton grouping set, would have groupSets = null.
If groupSets is present, the returned row type would include an indicator column for each grouping key.