The inner connection should be unreferenced, but the property should not be removed from the object

As seen here => http://technet.microsoft.com/en-us/library/cc626307(v=sql.105).aspx

TimeType resets date fields (i.e. unused DateTime object fields) to UNIX
epoch (1970-01-01). This makes TIME field mapping stabe (i.e. same time
will be always mapped to the same DateTime fields).

See DDC-179 (similar issue with DateType). Fixes DBAL-993.

each $part does not contain ".", so quoteSingleIdentifier may be called directly thus avoiding recursive strpos checks.