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Beschreibung
When new columns are added to a pinot table, the server is able to automatically generate default columns for the new added columns. There are 2 types of default column that can be auto-generated:
- New added column without transform function: default column will be filled with default null value (always dictionary encoded)
- New added column with transform function (derived column): default column will be filled with values calculated based on the transform function
There are 2 things not handled right now:
- Generate default column raw forward index (not dictionary encoded)
- Support transform function on another new added column: we need to calculate the dependency between new added columns, and generate them in sequence
See BaseDefaultColumnHandler for details