allows updating the rows in _vt.vreplication after MoveTables has setup the
streams. For example, you can add some filters to specific tables or change the
projection clause to modify the values on the target. This
provides an easier way to create simpler Materialize workflows by first using
MoveTables with auto_start false, updating the BinlogSource as required by your
Materialize and then start the workflow.
changing the copy_state and/or pos values to restart a broken MoveTables workflow
from a specific point of time.
If set, the workflow will stop once the Copy phase has been completed i.e. once
all tables have been copied and VReplication decides that the lag
is small enough to start replicating, the workflow state will be set to Stopped.