[jira] [Created] (RYA-416) Add the ability use the MongoDB aggregation pipeline to evaluate simple SPARQL expressions

["Jesse Hatfield (JIRA)" <ji...@apache.org>]

Jesse Hatfield created RYA-416:
----------------------------------

             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.



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)