Compare number of documents of the VC #797
Description
Nils has prepared KoralQuery for virtual corpora (VC) in W1-gesamt. They have been imported in the test instance, excluding the VC with 1-character-name (see #788). To ensure the completeness of the VC, we are checking the statistics by comparing the document numbers of the VC in KorAP and C2.
It turns out there are many VC that have significant differences in numbers. This requires further investigation.
Besides, it is not straightforward, since KorAP includes other documents than W1-gesamt. The virtual corpora should be additionally filtered with W1-gesamt virtual corpus. But W1-gesamt VC itself differs a lot in KorAP and C2.
Many documents are missing from KorAP, that can be added to the index.