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"[SOLVED] Aggregation: generating collections grouped by attrbutes"
I have a data set with three attributes: first, second and rank.
I have sorted the data-set so that it is ordered first by "first" and then rank.
I need to:
1. generate subsets of the data grouped by "first"
2. for each group data-set select the first k elements
In the end I would like to select any group data-set via the "first" attribute.
Anyone know if this is possible?
If so how?
P.S: I have looked at Aggregation and Collections to no avail