GitHub user okram opened a pull request:
https://github.com/apache/tinkerpop/pull/471
TINKERPOP-1506: Optional/Coalesce should not allow sideEffect traversals.
https://issues.apache.org/jira/browse/TINKERPOP-1506
`g.V(1).optional(addV())` created 2 vertices, not one. This is because
`optional()` was implemented with the branch-step `ChooseStep`. This has been
fixed with a custom `OptionalStep`. Test cases added to verify correct behavior.
Added to `master/` as this is a breaking change. Though, the previous
behavior can easily be deemed a bug.
VOTE +1.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/apache/tinkerpop TINKERPOP-1506
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tinkerpop/pull/471.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 #471
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commit 40971c95903077d38cb754843eb914b5548f5c1f
Author: Marko A. Rodriguez <okramma...@gmail.com>
Date: 2016-10-31T18:03:33Z
added OptionalStep to be used instead of optional() being backed by
ChooseStep. This fixes a side-effect issue.
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