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https://issues.apache.org/jira/browse/RYA-416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16300681#comment-16300681
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ASF GitHub Bot commented on RYA-416:
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GitHub user jessehatfield opened a pull request:
https://github.com/apache/incubator-rya/pull/254
RYA-416 Optionally invoke aggregation pipeline to execute MongoDB queries
[WIP] Provides tools for converting some or all of a SPARQL query to an
aggregation pipeline.
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## Description
>What Changed?
[Brief Description of what changed]
### Tests
>Coverage?
[Description of what tests were written]
### Links
[Jira](https://issues.apache.org/jira/browse/RYA-NUMBER)
### Checklist
- [ ] Code Review
- [ ] Squash Commits
#### People To Reivew
[Add those who should review this]
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jessehatfield/incubator-rya
RYA-416-aggregation-pipeline
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-rya/pull/254.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #254
----
commit 3eed2f92cc534768a6627a8c348eeef2c820c0e9
Author: Jesse Hatfield <jesse.hatfield@...>
Date: 2017-12-21T22:32:47Z
A new query node type to represent a MongoDB aggregation pipeline whose
results can be converted to binding sets, and tools for optionally transforming
some SPARQL expressions into such a node.
----
> 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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