rihad <rihad(at)mail(dot)ru> writes:
> What if only English letters are used in the textual indices (ascii
> 0-127), would they still be impacted after datctype&datcollate
> "C"->"en_US.UTF-8" change?
Yes, as even minimal testing would have told you. C sort order is
more case-sensitive, for instance.
regards, tom lane