On 26.01.2012 14:46, emre.haseg...@tart.com.tr wrote:
The following bug has been logged on the website:
Bug reference: 6411
Logged by: Using a Foreign Table in a Dependent Subquery
Email address: emre.haseg...@tart.com.tr
PostgreSQL version: 9.1.2
Operating system: Linux 3.0.0-14-generic #23-Ubuntu SMP Mon Nov 21 2
Description:
I installed Dave Page's MySQL Foreign Data Wrapper on GitHub [1]. It works
fine until foreign table is used in a dependent subquery on select clause.
This mailing list is really for bugs in PostgreSQL itself, but I'll give
this a shot...
How to reproduce:
Create extension mysql_fdw;
Create server AMySQLServer
foreign data wrapper mysql_fdw
options (address '***', port '3306');
Create user mapping for public
server AMySQLServer
options (username '***', password '***');
Create foreign table AForeignTable (id integer) server AMySQLServer options
(query 'Select id from ASchema.ATable');
Select id, (select true from AForeignTable where AForeignTable.id =
ATable.id) from ATable;
WARNING: 57P02: terminating connection because of crash of another server
process
DETAIL: The postmaster has commanded this server process to roll back the
current transaction and exit, because another server process exited
abnormally and possibly corrupted shared memory.
HINT: In a moment you should be able to reconnect to the database and
repeat your command.
[1] https://github.com/dpage/mysql_fdw
I'm guessing that there's mysql_fdw's rescan function isn't working
correctly. Looking at the source, it seems to be calling
"mysql_row_seek(festate->result, 0);". But according to MySQL's docs
[1], that 2nd argument should be an opaque value returned by
mysql_row_tell() or mysql_row_seek(), not a row number. I think
mysql_data_seek should be used there instead of mysql_row_seek().
That said, I have no idea if that's causing the crash.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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