SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Function map (alias m) (children 1)
     ExpressionList (children 4)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'11\'
        Literal \'UInt64\'
      Literal \'v1\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'22\'
        Literal \'UInt64\'
      Literal \'v2\'
    Function toJSONString (alias s) (children 1)
     ExpressionList (children 1)
      Identifier m
    Function isValidJSON (children 1)
     ExpressionList (children 1)
      Identifier s
