Hello,
I was stressing the BaseX 8.6 planner/optimizer when I noticed that
expressions like `count(//elem)` are not optimized at all, even though
they are correctly indexed, as demonstrated by `index:element-names()`.
The current database is a 300 MB TEI document. All the elements are in
the `http://www.tei-c.org/ns/1.0` namespace.
The following test case will report the correct number, but it will take
a couple of seconds to run, instead of a few milliseconds.
```
declare namespace tei="http://www.tei-c.org/ns/1.0";;
let $n := index:element-names("monier")[. = 're']/@count
let $c := count(//tei:re)
return <res><in-index>{$n}</in-index><in-doc>{$c}</in-doc></res>
```
I wonder if the presence of the namespace somehow confuses the
optimizer. The same problem can be observed running the same test case with
```
declare default element namespace "http://www.tei-c.org/ns/1.0";;
[...]
let $c := count(//re)
```
Regards,
--
Gioele Barabucci <[email protected]>
