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Re: Pipelined functions in Postgres

From: "Shoaib Mir" <shoaibmir(at)gmail(dot)com>
To: "Milen Kulev" <makulev(at)gmx(dot)net>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Pipelined functions in Postgres
Date: 2006-09-19 21:05:17
Message-ID: bf54be870609191405l5abc171cuc805c43bba0b0c42@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
I think pipelined functions are code you can pretend is a database table.

For example you can do it like this in Oracle:

select * from PLSQL_FUNCTION;

You can achieve something similar in PostgreSQL using RETURN SETOF functions
like this:

CREATE OR REPLACE FUNCTION test_pipe (int)
    RETURNS SETOF RECORD AS
$$
DECLARE
    v_rec    RECORD;
BEGIN
    FOR temp_rec IN (SELECT col FROM table where col > 10)
    LOOP
        RETURN NEXT v_rec;
    END LOOP;
    RETURN;
END;
$$ LANGUAGE plpgsql;

This function can be called like this:

SELECT * FROM test_pipe(10) AS tbl (col int);

Hope this helps...

Thanks,
-- 
Shoaib Mir
EnterpriseDB (www.enterprisedb.com)


On 9/20/06, Milen Kulev <makulev(at)gmx(dot)net> wrote:
>
> Hello Lister,
> I am curios whether I can emulate the Oracle pipelined functions
> functionality in PG too (using RETURN NEXT ). For more
> information and examples about Oracle pipelined functions see:
>
> http://asktom.oracle.com/pls/ask/f?p=4950:8:8127757633768425921::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:4447489221109
>
> I have used  pipeline functions in DWH enviromnent  with success and would
> like
> To use similar concept in PG too.
>
> Any help, examples , links and  shared experiences would be greately
> appreciated.
>
> Best Regards.
> Milen
>
>
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Subject: Re: Pipelined functions in Postgres
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