morningman opened a new pull request #3340: [SegmentV2] Optimize the upgrade 
logic of SegmentV2
URL: https://github.com/apache/incubator-doris/pull/3340
 
 
   This CL mainly made the following modifications:
   
   1. Reorganized SegmentV2 upgrade document.
   2. When the variable `use_v2_rollup` is set to true, the base rollup in v2 
format is forcibly queried for verifying the data.
   3. Fix a problem that there is no persistent storage format information in 
the schema change operation that performs v2 conversion.
   4. Allow users to directly create v2 format tables.

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