SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Literal UInt64_1
    Identifier result
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function c (children 1)
       ExpressionList (children 1)
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier a
          Literal UInt64_0
