GitHub user okram opened a pull request:
https://github.com/apache/tinkerpop/pull/477
TINKERPOP-1473: Given PathRetractionStrategy, PathProcessorStrategy can be
extended to support partial where() inlining.
https://issues.apache.org/jira/browse/TINKERPOP-1473
Extended `PathProcessStrategy` to support the following translations which
expose more traversals to OLAP processing (works around local star graph
violations).
```
where(as(a).out().as(b)) => as(xyz).select(a).where(out().as(b)).select(xyz)
where(as(a).out()) => as(xyz).select(a).filter(out()).select(xyz)
```
Next, given that `PathProcessStrategy` is prior to `InlineFilterStrategy`
you get this effect:
where(as(a).has(z)) => as(xyz).select(a).has(z).select(xyz)
```
You can see why `PathRetractionStrategy` is important. Without it `xyz`
(which are UUIDs in practice) would remain in the traverser's path data.
VOTE +1.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/apache/tinkerpop TINKERPOP-1473
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tinkerpop/pull/477.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 #477
----
commit a69efffef138b036581fdb8c5bcd22c8075aa846
Author: Marko A. Rodriguez <[email protected]>
Date: 2016-11-02T10:50:57Z
Added where(a.out.b) => select(a).where(out.b) AND where(a.out) =>
select(a).filter(out) to PathProcessorStrategy (an OLAP strategy). This opens
up more traversals that would otherwise break the star-graph local child
constraint in OLAP.
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