Commits on Aug 15, 2016

1. Schema evolution: Default values for newly added columns …

   Added functionality of adding new columns with default value in DefaultColumnHandler.
   Let DefaultColumnHandler take a schema argument to control the newily added columns.
   The schema is passed down from the Helix property store.
   Inside SegmentMetadataImpl, add methods to modify and store the segment metadata.
   Support ADD, UPDATE, REMOVE operation on newly added columns.
   Support segment format v1 and v3.
   The DefaultColumnHandler is constructed inside SegmentPreProcessor.
   Added unit test and integration test for all types of newly added columns.

   

   Jackie-Jiang committed Aug 15, 2016
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