CreateQuery groups (children 3)
 Identifier groups
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration gid (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration gname (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
