[GitHub] carbondata issue #1861: [CARBONDATA-2078][CARBONDATA-1516] Add 'if not exist...

[xubo245]

Github user xubo245 commented on the issue:

    https://github.com/apache/carbondata/pull/1861
  
    createPreAggregateTableCommands will be none  in processData when we create 
datamap with "if not exists" syntax .
    
    so When will throw error? can you give a example for " processData will 
throw error because createPreAggregateTableCommands is not initialized"? 


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