## [0.1.4] - Unreleased

- Prepare documents for the 'Transposed DataFrame Representation'
- Feedback to Red Arrow
- Separate documents

- `DataFrame`
  - Introduce updating capabilities
  - Introduce NA support
  - Add slice method

- `Vector`
  - Add NaN support for functions
  - Support more functions

## [0.1.3] - 2022-05-15 (experimental)

- Bug fixes
  - Fix boolean functions in `Vector` to align with Ruby's behavior
    - `&` == `and_kleene`
    - `|` == `or_kleene`
  - Quote strings of data-preview in `DataFrame#inspect`
  - Quote empty and blank keys in `DataFrame#inspect`
  - Respond to error for a wrong key in `DataFrame#[]`

- New features and improvements
  - `DataFrame`
    - Display nil elements in `inspect`
    - Show NaN and nil counts in `inspect`
    - Refactor `inspect`
    - Add method `key` and `key_index`
    - Add how to load/save Parquet to README

  - `Vector`
    - Add categorization functions
      
      This is an important step to support `slice` method and NA treatment features.
      -  `is_finite`
      -  `is_inf`
      -  `is_na` (RedAmber original)
      -  `is_nan`
      -  `is_nil`, `is_null`
      -  `is_valid`
    - Show in a reduced representation for long array in `inspect`
    - Support options in aggregatiton functions
    - Return values in non-arrow object for scalar aggregation functions

## [0.1.2] - 2022-05-08 (experimental)

- Bug fixes:
  - `DataFrame`
    - Fix bug in `#[]` with end-less Range
- New features and improvements
  - Add support for Arrow 8.0.0
  - `DataFrame`
    - `types` and `data_types`
    - Range is usable to specify columns in `#[]`
  - `Vector`
    - `type` and `data_type`

## [0.1.1] - 2022-05-06 (experimental)

- Release on rubygems.org
- Introduce class `DataFrame`
  -  New from Hash, schema/rows, `Arrow::Table`, `Rover::DataFrame`
  -  Load from file, string, URI
  -  Save to file, string, URI
  -  Methods for basic properties
  -  Rich inspect method
  -  Basic selecting by `#[]`
- Introduce class `Vector`
  -  New from a column in a `DataFlame`
  -  New from `Arrow::Array`, `Arrow::ChunkedArray`, `Array`
  -  Methods for basic properties
  -  Function support
     -  Unary aggregations
     -  Unary element-wises
     -  Binary element-wises
     -  Some operators defined

## [0.1.0] - 2022-04-15 (unreleased)

- Initial version