IPPlan tries to use a table named 'schema', which is
NOT a good idea. It is reserved by mysql 5 as well as
in other database engines. There is an ugly work
around in the code for some engines, but just adding
mysql in there won't be enough.
One workaround that should fix this issue for good
would be to always refenrence this table using
databasename.schema. This fixes things at least for
mysql, and it might fix it for good in the other
database engines as well.