[GitHub] [carbondata] ajantha-bhat opened a new pull request #3380: [CARBONDATA-3515] Limit local dictionary size to 10% of configured blockletsize

[GitBox <gi...@apache.org>]

ajantha-bhat opened a new pull request #3380: [CARBONDATA-3515] Limit local dictionary size to 10% of configured blockletsize
URL: https://github.com/apache/carbondata/pull/3380
 
 
   **problem:** currently local dictionary max size is 2GB, because of this for varchar columns or long string columns, local dictionary can be of 2GB size. so, as local dictionary is stored in blocklet. blocklet size will exceed 2 GB, even though configured maximum blocklet size is 64MB. some places inter overflow happens during casting.
   
   **solution:** limit the local dictionary size to 10% of maximum allowed blocklet size
   
   Be sure to do all of the following checklist to help us incorporate 
   your contribution quickly and easily:
   
    - [ ] Any interfaces changed? NA
    
    - [ ] Any backward compatibility impacted? NA
    
    - [ ] Document update required? NA
   
    - [ ] Testing done. done
          
    - [ ] For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.  NA
   
   

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