On 09/02/2013 01:02 AM, Reindl Harald wrote:

so something goes wrong in combination with libzdb IMHO this *must not* happen if MariaDB claims to be a drop-in-replacemnet

I've done some additional investigation, and indeed MariaDB appears to mess up the server cursor when a blob is in the result.

I'm attaching a test-case and with a schema and data for you to use.

10.0.4-MariaDB-1~precise-log libzdb-2.11.2

libzdb uses mysql_stmt_fetch to move the server cursor forward. This has worked flawlessly until now for MySQL, SQLite, PostgreSQL and Oracle. With MariaDB we seem to hit a problem as soon as a blob column is in the columns.

https://github.com/tildeslash/libzdb/blob/master/src/db/mysql/MysqlResultSet...

Just try the test program with and without the 'p.data' column, and run it. Since part_order is the primary ordering key, I use that to test for result integrity.