Re: [HACKERS] no test coverage for ALTER FOREIGN DATA WRAPPER nameHANDLER ...

On 2017/09/13 16:59, Ashutosh Bapat wrote:
> On Wed, Sep 13, 2017 at 1:27 PM, Amit Langote
> <Langote_Amit_f8@lab.ntt.co.jp> wrote:
>> On 2017/09/13 16:42, Ashutosh Bapat wrote:
>>> On Wed, Sep 13, 2017 at 7:49 AM, Amit Langote wrote:
>>>> In the attached updated patch, I created separate .source files in
>>>> src/test/regress/input and output directories called fdw_handler.source
>>>> and put the test_fdw_handler function definition there.  When I had
>>>> originally thought of it back when I wrote the patch, it seemed to be an
>>>> overkill, because we're just normally defining a single C function there
>>>> to be used in the newly added foreign_data tests.  In any case, we need to
>>>> go the .source file way, because that's the only way to refer to paths to
>>>> .so library when defining C language functions.
>>>
>>> It still looks like an overkill to add a new file to define a dummy
>>> FDW handler. Why do we need to define a handler as a C function? Can't
>>> we define handler as a SQL function. If we could do that we could add
>>> the function definition in foreign_data.sql itself.
>>
>> I guess that's because the last time I tried to define the handler as a
>> SQL function, I couldn't:
>>
>> create function test_fdw_handler() returns fdw_handler as '' language sql;
>> ERROR:  SQL functions cannot return type fdw_handler
>>
>> fdw_handler is a pseudo-type, which neither SQL nor plpgsql function can
>> return.
>>
>> Am I missing something?
> 
> Ok. May be then create_function_1.sql is the right place. Just add it
> to the section of passing tests and annotate that it's testing
> creating an FDW handler. Sorry for jumping back and forth.

Alright, done.  Thanks for reviewing.

Regards,
Amit

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