SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function plus (alias x) (children 1)
     ExpressionList (children 2)
      Function toIntervalYear (children 1)
       ExpressionList (children 1)
        Function minus (children 1)
         ExpressionList (children 2)
          Identifier number
          Literal UInt64_15
      Function toDate (children 1)
       ExpressionList (children 1)
        Literal \'2017-01-01\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_30
