cubicweb #1561806 RQL constraints variable namespaces [resolved]

As far as I understood a recent bug in my application, RQL constraints on a single relation are concatenated, so a variable name should not be reused (unless they represent the same entities, like "S" and "O"). It should be either clearly documented or fixed.

priorityimportant
typeenhancement
done in3.12.0
load left0.000
closed by#5e2f93b88d86 [entity vocabulary] refactor unrelated rql to allow usage of RQLRewriter to insert schema constraints. Closes #1561806