Unexpected data at end of column_count packet

[bgrainger]

This exception indicates that the MySQL server sent extra data when a "column count" packet was expected.

The ProtocolText::ResultSet is supposed to contain:

• column_count packet
• n column definitions
• (optional) EOF
• m result set rows
• OK or EOF

If there is another result set, this group of packets may be repeated. This exception can be thrown when the final EOF indicates that there is another result set, but some other kind of packet is sent instead.

[bgrainger]

This exception has been observed when executing a stored procedure against a Galera cluster: #267

[bgrainger]

This issue has been created as a home for the exception message in the bug title, and to link related crash reports. No specific fix is currently planned as it appears to be a server problem.