与此呼叫相符的声明太多

Question

用于类型编译的构造函数代码，但是我的代码并未明确匹配它。

我尝试创建一种仅覆盖默认构造函数的类型（该构造函数希望将所有字段用作参数），但是这给了我一个语法错误。

create or replace 
type QUARTER_RANGE as OBJECT 
(
    START_QUARTER VARCHAR(6),
    END_QUARTER VARCHAR(6),
    constructor function QUARTER_RANGE return self as result,
    constructor function QUARTER_RANGE(startQuarterIn VARCHAR, endQuarterIn VARCHAR) return self as result
);

create or replace 
type body QUARTER_RANGE as
    constructor function QUARTER_RANGE return self as result
    as
    begin
        self.start_quarter := null;
        self.end_quarter := null;
        return;
    end;

    constructor function QUARTER_RANGE(startQuarterIn VARCHAR, endQuarterIn VARCHAR) return self as result
    as 
    begin
    if not some_validation_function(startQuarterIn) then
            RAISE_APPLICATION_ERROR (-20000, 'Invalid start quarter id'||startQuarterIn);
        elsif not some_validation_function(startQuarterIn) then
            RAISE_APPLICATION_ERROR (-20000, 'Invalid end quarter id'||endQuarterIn);
        else
            self.start_quarter := startQuarterIn;
            self.end_quarter := endQuarterIn;
        end if;
        return;
    end;
end;

declare 
  testString varchar(256);
begin

  testString := '2019Q1';

  -- The code below generates 
  -- PLS-00307: too many declarations of 'QUARTER_RANGE' match this call
  inputQuarterRange:= QUARTER_RANGE(testString,testString);

  -- I tried this code below in an attempt to force it to match
  -- the varchar types but it also generates the same error
  -- PLS-00307: too many declarations of 'QUARTER_RANGE' match this call
  inputQuarterRange:= QUARTER_RANGE('2019Q1','2019Q1');

end;