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This package provides aggregation functions operating on IndexView indexed views of etable.Table data, along with standard AggFunc functions that can be used at any level of aggregation from etensor on up.
The main functions use names to specify columns, and *Index and *Try versions are available that operate on column indexes and return errors, respectively.
See the tsragg package for functions that operate directly on a etensor.Tensor without the index view indirection.