[GitHub] carbondata issue #1540: [CARBONDATA-1784] clear column group code

[zzcclp]

Github user zzcclp commented on the issue:

    https://github.com/apache/carbondata/pull/1540
  
    @chenliang613 , it seems there are many places about column group need to 
be removed, for example:
    in TableNewProcessor.process():
    
    `checkColGroupsValidity(cm.columnGroups, allColumns, highCardinalityDims)`
    `updateColumnGroupsInFields(cm.columnGroups, allColumns)`
    
    Method 'checkColGroupsValidity' and 'updateColumnGroupsInFields' also can 
be removed.
    
    Method 'CarbonDDLSqlParser.updateColumnGroupsInField' also can be removed.
    
    Suggestion: in CarbonDDLSqlParserprepareTableModel, we can throw an 
exception when user define 'column_groups' in TBLPROPERTIES.
    



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