Work in progress: ColumnFromBroadcast and ColumnFromAggregation #107
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This PR adds two more derived variable templates. This continues the implementation of issue #98. Like the first column template, they use settings objects (PR #108).
ColumnFromBroadcast
Template to register a column of derived data, generated by mapping values from another table via one or more join keys. Values calculated lazily.
Parameters:
Example use cases:
ColumnFromAggregation
Template to register a column of derived data, generated by aggregating values from another table using group-by with a join key. Values calculated lazily.
Parameters:
Example use cases:
Versioning
To do before merging