Add replace the the view DDL in "show create view"

[EliorMoz]

It will be handy if when running the "show create view" the DDL will contain "replace" For example :
Instead of "create view view_name as ....", "create or replace view view_name as ...." .

[guyco33]

Maybe it can be implemented by having a new option in the show command, something like

SHOW CREATE OR REPLACE VIEW some_view

[ebyhr]

cc: @martint