#33 Illegal query in getScanBatch method

[Todd Atkins]

I am submitting a fix to an illegal query in the getScanBatch method in scan.py that is causing pyvscd to get stuck under certain circumstances. The problem is with the reference of a column alias in a WHERE clause as described at

http://dev.mysql.com/doc/refman/4.1/en/problems-with-alias.html

[Todd Atkins]