Jesse Hatfield created RYA-416:
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Summary: Add the ability use the MongoDB aggregation pipeline to
evaluate simple SPARQL expressions
Key: RYA-416
URL: https://issues.apache.org/jira/browse/RYA-416
Project: Rya
Issue Type: New Feature
Reporter: Jesse Hatfield
Assignee: Jesse Hatfield
MongoDB provides the [aggregation pipeline
framework|https://docs.mongodb.com/manual/core/aggregation-pipeline/] for
multi-stage data processing. Currently, the query engine invokes this framework
to apply individual statement patterns (using a "$match" expression for each
and iterating through the results), then applies higher-level query operations
(join, filter, select, project, etc) client-side.
In principle, those high-level query operations could be rewritten as
aggregation pipeline stages as well ($group, $match, $project, etc). This would
allow more query evaluation logic to be executed by the MongoDB server itself,
enabling server-side optimization. This could be used as a general query
optimization, but would additionally be useful for any tool that only needed to
write query results back to the server: adding a write step to the end of the
resulting pipeline could obviate the need to communicate individual results to
the client at all.
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