String field collation

Moved from GitHub dgraph/3446

Posted by Scapal:

Let specify the collation for string fields (Ie. the way it is compared hence sorted).
For the moment lowercase and uppercase are handled differently when applying a sort.
This could also be used by text filters, the field collation determining if a letter with an accent should be considered as different or not.

campoy commented :

Thanks for the proposal, @Scapal!

We will consider it and it to the roadmap if enough people request it.