it is not possible to evaluate a query with only meta data restrictions without weighting

[patrickfrey]

If you issue an empty query, you get an empty result. This is logically correct.
But sometimes it is wished to inspect a subset of the collection only defined by meta data restrictions or negative feature restrictions. This is not implemented yet.

For example inspect all documents inserted today.

[patrickfrey]

Maybe this should be defined as different use case. It could be possible to browse through documents in a range of keys and to take this as primary key to find the selected documents. Something like Query::defineSelectionFeatureRange using something like StorageClient::createTermRangePostingIterator(..)

[patrickfrey]

If you have many of these criteria, you can merge them

[patrickfrey]

There exists a method for creating a posting iterator based on a restriction for this purpose:
PostingIteratorInterface* StorageClientInterface::createBrowsePostingIterator(
const MetaDataRestrictionInterface* restriction,
const Index& maxpos) const;