[GitHub] carbondata issue #2620: [CARBONDATA-2839] Add custom compaction example

[zzcclp]

Github user zzcclp commented on the issue:

    https://github.com/apache/carbondata/pull/2620
  
    @xuchuanyin it means that it can compact specified segments which are 
assigned by users:
    `ALTER TABLE custom_compaction_table COMPACT 'CUSTOM' WHERE SEGMENT.ID IN 
(1,2)` 


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