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https://issues.apache.org/jira/browse/TINKERPOP-1832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16262188#comment-16262188
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ASF GitHub Bot commented on TINKERPOP-1832:
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GitHub user pietermartin opened a pull request:
https://github.com/apache/tinkerpop/pull/756
TINKERPOP-1832: TraversalHelper.replaceStep sets previousStep to the wrong
step
`TraversalHelper.replaceStep` needs to first remove the step before adding
in the new step. Else it gets its `previousStep` pointer wrong.
Added `TraversalHelperTest.shouldSetPreviousStepToEmptyStep` which was the
scenario that originally made me aware of the issue.
Ran `mvn clean install` and tested Sqlg's tests with the fix.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/pietermartin/tinkerpop TINKERPOP-1832
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/tinkerpop/pull/756.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 #756
----
commit 8bc4b36f52d12e37b7d8f37f7d2240caa233106f
Author: pieter <[email protected]>
Date: 2017-11-22T08:56:43Z
TINKERPOP-1832 - Fix bug where TraversalHelper.replaceStep sets the steps'
previousStep incorrectly.
It needs to remove the replaced step before inserting the new step.
----
> TraversalHelper.replaceStep sets previousStep to the wrong step
> ---------------------------------------------------------------
>
> Key: TINKERPOP-1832
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1832
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.3.0
> Reporter: pieter martin
> Assignee: Daniel Kuppitz
>
> The bug is described over
> [here|http://mail-archives.apache.org/mod_mbox/tinkerpop-dev/201710.mbox/browser]
> I have tested [~dkuppitz] fix for it and all seems well.
> {code:java}
> public static <S, E> void replaceStep(final Step<S, E> removeStep, final
> Step<S, E> insertStep, final Traversal.Admin<?, ?> traversal) {
> final int i;
> traversal.removeStep(i = stepIndex(removeStep, traversal));
> traversal.addStep(i, insertStep);
> }
> {code}
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