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https://issues.apache.org/jira/browse/NIFI-5026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16418619#comment-16418619
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ASF subversion and git services commented on NIFI-5026:
-------------------------------------------------------
Commit fd31c161a25fe6009ce35c1e554d4eeb6ed320fd in nifi's branch
refs/heads/master from [~markap14]
[ https://git-wip-us.apache.org/repos/asf?p=nifi.git;h=fd31c16 ]
NIFI-5026: Refactored StandardPreparedQuery so that instead of a List of
Strings that may or may not correspond to compiled expressions and a Map of
String to Compiled Expression, the StandardPreparedQuery now just takes a List
of Expression objects, and those Expressions can be evaluated to return the
proper result
Signed-off-by: Pierre Villard <pierre.villard...@gmail.com>
This closes #2592.
> Expression Language Query.prepare function can sometimes ignore escape
> sequence
> -------------------------------------------------------------------------------
>
> Key: NIFI-5026
> URL: https://issues.apache.org/jira/browse/NIFI-5026
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Major
> Fix For: 1.7.0
>
>
> As reported on the [dev@n.a.o|mailto:dev@n.a.o] mailing list:
>
> Hi,
> It looks like I have stumbled upon a bug in substitution of evaluated
> expressions.
> A test case:
> {code:java}
> String result =
> org.apache.nifi.attribute.expression.language.Query.prepare("${foo}$${foo}").evaluateExpressions(Collections.singletonMap("foo",
> "bar"), null);{code}
> Expected result:
> {code:java}
> bar${foo}{code}
> Observed result:
> {code:java}
> barbar{code}
> The issue exists in 1.5.0 and, as far as I can tell, in the master branch.The
> cause is quite simple: Query.prepare(...) splits the input string into pieces
> to be evaluated and substituted or to be copied literally, but it doesn't
> keep track of which is which.That couldn't possibly work. If a piece to be
> copied literally happens to be equal to one of the pieces to be substituted,
> the things go wrong, as the test case demonstrates.
> Regards,Sergei.
>
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