Priyank Porwal created PHOENIX-5682:
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             Summary: IndexTool can just update empty_column with verified if 
rest of index row matches
                 Key: PHOENIX-5682
                 URL: https://issues.apache.org/jira/browse/PHOENIX-5682
             Project: Phoenix
          Issue Type: Improvement
    Affects Versions: 4.14.3, 4.15.1
            Reporter: Priyank Porwal
             Fix For: 4.15.1, 4.14.4, 4.16.0


When upgrading from old indexing design to new consistent indexing, 
IndexUpgradeTool kicks off IndexTool to rebuild the index. This index rebuild 
rewrites all index rows. If any index row was already consistent, it is 
rewritten + empty_column is updated with verified flag. 

IndexTool could potentially just update empty_column if rest of the index row 
matches with data rows. This would save the massive writes to the underlying 
dfs, as well as other side effects of these writes to replication.



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