Remove legacy executePlanFragments(), change length of procedurename in FragmentTaskMessage to short
Remove unused comment
Move counting from tableIterator and tableIndex to each executor itself, this is simpler and more intuitive implementation
Move counting from tableIterator and tableIndex to each executor itself, this is simpler and more intuitive implementation
Revert "Move counting from tableIterator and tableIndex to each executor itself, this is simpler and more intuitive implementation"

This reverts commit da512ed0ef4e027b7905bc56590c5b2f4cc6fbee.
Change method name