apache/pinot

Enhance the default column handling

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#8699 aperta il 13 mag 2022

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Descrizione

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:

  1. New added column without transform function: default column will be filled with default null value (always dictionary encoded)
  2. 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:

  1. Generate default column raw forward index (not dictionary encoded)
  2. 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

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