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Re: Pipelined functions in Postgres - Mailing list pgsql-performance

From Shoaib Mir
Subject Re: Pipelined functions in Postgres
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Msg-id [email protected]
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In response to Pipelined functions in Postgres  ("Milen Kulev" <[email protected]>)
Responses Re: Pipelined functions in Postgres
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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 <[email protected]> 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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