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Re: R: GSOC 2015 :UDFs returning arrays


Hi, Justin!

On Mar 10, Justin Swanhart wrote:
> wl#820 also has table functions in it:
> http://antbits.blogspot.com/2009/01/table-functions-in-mysql.html
> mysql> INSTALL PLUGIN Deep_Thought SONAME 'psm_example.so';
> mysql> CREATE FUNCTION test.FooAnswer()
>     -> RETURNS TABLE(answer TEXT)
>     -> NO SQL LANGUAGE Deep_Thought EXTERNAL NAME 'compute';
> mysql> CREATE VIEW foobar AS SELECT * FROM TABLE(test.FooAnswer) AS wibble;
> mysql> SELECT * FROM foobar WHERE answer LIKE 'F%';
> +-----------+
> | answer    |
> +-----------+
> | Forty-Two |
> +-----------+
Ah, indeed. Thanks.

It's still an unrelated feature - I mean, there is no reason why a table
function must necessarily be impemented as an external procedure.

And the implementation - I believe - creates a temporary table and puts
all the data into it. I would rather prefer a generator-like interface,
that produces rows one by one. It works much better for big data sets.
Or, may be, we can do both.

Either way - this implementation can be very helpful. But it'll need at
least to be updated to work in 10.1. And may be we add the generator


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