chaoyli commented on issue #2953: [segment_v2] Switch to Unified and Extensible 
Page Format
URL: https://github.com/apache/incubator-doris/pull/2953#issuecomment-590019622
 
 
   2. I think ZoneMap and OrdinalIndex Read/Writer logic remaining the same may 
be better. 
   Firstly ZoneMap and OrdinalIndex is simple, may not need to used 
IndexedColumnWriter/Reader complicated logic.
   Secondly IndexedColumnWriter will also contain all index writer, if we add 
BTree index in the futher.
   Thirdly if use the above optimization, the ZoneMap and OrdinalIndex also not 
suitable.

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