Github user afs commented on the pull request:
https://github.com/apache/jena/pull/95#issuecomment-149728229
cache Invalidation: it is very hard to know what an update (adds and
deletes) will change. This includes hard cases like an aggregation count, or a
SPARQL "NOT EXISTS".
Dropping everything for one dataset is reliable and has no corner cases.
The cache code is still useful - a lot of uses are for publishing where
updates are rare and queries are frequent.
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