Alias

Processor that defines named groups of columns. Once an alias is registered, later processors can refer to the group name wherever a column selection is expected, and it expands to the listed columns. This keeps long column lists out of repeated configuration.

Configuration

Selected as name: alias.

Option	Description	Type	Default
map	Mapping of group name to the list of columns it expands to.	mapping	required

- name: alias
  kwargs:
    map:
      position: [ x, y, z ]

Downstream usage example:

- name: copy
  kwargs:
    to: truth
    by: event_id
    cols: position  # equivalent to passing [x, y, z]