# Column Expand

Column Expand is used for adding arbitrary number of columns with
user-provided values. This module is run directly on dense table(raw
data), before data entering Data Transform.

<!-- mkdocs
## Param

::: federatedml.param.column_expand_param
    rendering:
      heading_level: 3
      show_source: true
      show_root_heading: true
      show_root_toc_entry: false
      show_root_full_path: false
-->