Re: segmentation fault with loopback query

Hey Stefano, Could you make a reproducible example? The trivial example I made using the UDF you provided does not result in a segfault. This is the example I tested: CREATE TABLE mytable(i DOUBLE, d DOUBLE); INSERT INTO mytable VALUES (1, 1), (2, 2), (3, 3), (4, 4), (5, 5); CREATE FUNCTION myfunc() RETURNS TABLE(n STRING) LANGUAGE PYTHON_MAP { res = _conn.execute("SELECT max(d) FROM mytable;") result = dict() result['n'] = str(res) return result }; SELECT * FROM myfunc(); Which gives the following (expected) result: +----------------------+ | n | +======================+ | {'L1': array([ 5.])} | +----------------------+ Regards, Mark ----- Original Message ----- From: "Stefano Fioravanzo" To: "users-list" Sent: Monday, June 6, 2016 10:58:37 AM Subject: Re: segmentation fault with loopback query Done! Stefano

On 06 Jun 2016, at 10:43, Stefan Manegold wrote:

Dear Stefano,

a segfault is always a bug. Please file a bug report via http://bugs.monetdb.org/

Thanks! Stefan

----- On Jun 6, 2016, at 10:38 AM, Stefano Fioravanzo fioravanzos@gmail.com wrote:

...

Hello,

I am trying to execute a loopback query in embedded python:

CREATE FUNCTION myfunc() RETURNS TABLE(n STRING) LANGUAGE PYTHON { res = _conn.execute("SELECT max(d) FROM mytable;")

result = dict() result['n'] = str(res) return result };

When accessing the object ‘res’, mserver5 outputs ‘segmentation fault’ and exits. I think that the issue is in using the max() function in the query, if I leave that out everything works fine. The function:

CREATE FUNCTION myfunc() RETURNS TABLE(n STRING) LANGUAGE PYTHON { res = _conn.execute("SELECT d FROM mytable;")

result = dict() result['n'] = str(res) return result };

outputs a correct dictionary.

Stefano _______________________________________________ users-list mailing list users-list@monetdb.org https://www.monetdb.org/mailman/listinfo/users-list

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