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From "ASF subversion and git services (Jira)" <>
Subject [jira] [Commented] (NIFI-6792) Evaluate Variable value containing expression language
Date Sat, 02 Nov 2019 14:25:00 GMT


ASF subversion and git services commented on NIFI-6792:

Commit 6864f3eb2509bd4eacd9028e3343f383a3b8bd7b in nifi's branch refs/heads/master from Manoj
[;h=6864f3e ]

added a function in Expression Language to
Evaluate Variable value containing expression Language
Build related changes
added license to newly added class
restyled the classes having maven-checkstyle related issues
made changes suggested by reviewer MikeThomsen

Expression Language function name changed from stringEL to evaluateELString

This closes #3829

Signed-off-by: Mike Thomsen <>

> Evaluate Variable value containing expression language
> ------------------------------------------------------
>                 Key: NIFI-6792
>                 URL:
>             Project: Apache NiFi
>          Issue Type: New Feature
>          Components: Core Framework, Documentation &amp; Website
>    Affects Versions: 1.10.0
>            Reporter: Manoj Mamidyala
>            Assignee: Manoj Mamidyala
>            Priority: Minor
>              Labels: Development, expression-language, feature
>   Original Estimate: 48h
>          Time Spent: 40m
>  Remaining Estimate: 47h 20m
> Evaluate Variable value containing expression language
> I loaded custom properties into nifi.
> The registry variable called query has value "SELECT * FROM table WHERE id = ${id_no}"
where the id_no is coming from the flowfile attributes. There was no functionality in nifi
to evaluate the expression language inside the value.
> So, need to add functionality such that we can evaluate EL inside the variables.
> example: ${query:stringEl}
> where function `stringEl` will evaluate the EL value inside the query variable

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