eComplex queries in that case are queries, which are passed to lucene not containing all original constraints. For example queries with multiple path restrictions like:
In that particular case the index planer gives ":fulltext:ipsum" to lucene even though the index supports evaluating path constraints.
As counting the facets happens on the raw result of lucene, the returned facets are incorrect. For example having the following content
the expected result for the dimensions of simple/tags and the query above is
- tag1: 2
- tag2: 2
as the result set is 2 results long and all documents are equal. The actual result set is
- tag1: 3
- tag2: 3
as the path constraint is not handled by lucene.
To workaround that the only solution that came to my mind is building the disjunctive normal form of my complex query and executing a query for each of the disjunctive statements. As this is expanding exponentially its only a theoretical solution, nothing for production.