Aklakan opened a new pull request, #3995:
URL: https://github.com/apache/jena/pull/3995
GitHub issue resolved #3994
Pull request Description: Adds skip scan evaluation for single-pattern
queries to TDB2. Added special code paths to `OpExecutorTDB2` for `OpDistinct`
and `OpGroupBy`.
Execution time to find all distinct predicates Wikidata truthy (8B triples)
becomes between 1 and 100 seconds (warm-cold caches)
Also works for simple group by patterns.
`SELECT DISTINCT ?p (COUNT(DISTINCT ?g) AS ?x) { GRAPH ?g { ?s ?p ?o } }
GROUP BY ?p`
Need yet to add tests - such as create permutations of patterns and compare
results with a reference engine (eg. ARQ).
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- [ ] Tests are included.
- [ ] Documentation change and updates are provided for the [Apache Jena
website](https://github.com/apache/jena-site/)
- [ ] Commits have been squashed to remove intermediate development commit
messages.
- [ ] Key commit messages start with the issue number (GH-xxxx)
By submitting this pull request, I acknowledge that I am making a
contribution to the Apache Software Foundation under the terms and conditions
of the [Contributor's
Agreement](https://www.apache.org/licenses/contributor-agreements.html).
----
See the [Apache Jena "Contributing"
guide](https://github.com/apache/jena/blob/main/CONTRIBUTING.md).
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