CreateQuery aggr (children 3)
 Identifier aggr
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration n (children 1)
    DataType int
   ColumnDeclaration s (children 1)
    DataType AggregateFunction (children 1)
     ExpressionList (children 2)
      Identifier max
      DataType String
 Storage definition (children 2)
  Function MergeTree
  Identifier n
