morningman opened a new pull request #4387:
URL: https://github.com/apache/incubator-doris/pull/4387


   ## Proposed changes
   
   SInce the Segment V2 has been released for a long time, we should make it as 
default storage format for newly created table.
   
   This CL mainly changes:
   1. For all newly created tables, their default storage format is Segment V2.
   2. For all already exist tablets, their storage format remain unchanged.
   3. Fix  bugs described in Fix #4384 and Fix #4385
   
   ## Types of changes
   
   
   - [x] Bugfix (non-breaking change which fixes an issue)
   - [x] Breaking change (fix or feature that would cause existing 
functionality to not work as expected)
   - [x] Documentation Update (if none of the other choices apply)
   
   ## Checklist
   
   - [x] I have create an issue on (Fix #4386), and have described the 
bug/feature there in detail
   - [x] Compiling and unit tests pass locally with my changes
   - [x] I have added tests that prove my fix is effective or that my feature 
works
   - [x] If this change need a document change, I have updated the document
   - [x] Any dependent changes have been merged
   
   ## Further comments
   
   We should provide a more friendly way to check the conversion progress of 
Segment V2
   


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