CreateQuery tab (children 3)
 Identifier tab
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration m1 (children 1)
    DataType Map (children 1)
     ExpressionList (children 2)
      DataType String
      DataType AggregateFunction (children 1)
       ExpressionList (children 2)
        Identifier sum
        DataType UInt32
 Storage definition (children 2)
  Function MergeTree
  Identifier m1
