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Joins between dataframes and nil init of dataseries #110

Merged
merged 9 commits into from Aug 2, 2019
Commits on Jul 15, 2019
  1. Added innerJoin for dataframes using rowNames

    AtharvaKhare committed Jul 13, 2019
    Duplicate column names are renamed to `_x` and `_y` respectively.
  2. Added outerJoin for dataframes using rowNames

    AtharvaKhare committed Jul 14, 2019
    Also dded a private method to get output columns of a join operation.
  3. Added innerJoin of dataframes using columns as keys

    AtharvaKhare committed Jul 15, 2019
    Also added a `findAll: atColumn` and `findAllIndicesOf: atColumn` method to
    gather rows with specific object at given column.
    
    Note: The join operation does not sort keys.
  4. Fixed bug preventing creation of empty DataSeries

    AtharvaKhare committed Jul 15, 2019
    `#() asDataSeries` used to fail.
    Added relevant tests.
  5. Added rightJoin of dataframes using columns as keys

    AtharvaKhare committed Jul 15, 2019
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