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https://issues.apache.org/jira/browse/NIFI-10042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brendan updated NIFI-10042:
---------------------------
    Priority: Minor  (was: Major)

> Expression ifElse Treats Parameter as Text.
> -------------------------------------------
>
>                 Key: NIFI-10042
>                 URL: https://issues.apache.org/jira/browse/NIFI-10042
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Brendan
>            Priority: Minor
>
> When using expression language on Attribute and storing a reusable expression 
> as a parameter e.g get last day of month based on todays date
> the if Else condition will treat the parameters as raw text and not validate 
> the expression in the parameter.
> e.g
> {code:json}
> {code:json}
> ${data_quality_performance_as_of_date
>   :isEmpty()
>   :not()
>   :ifElse(
>     ${data_quality_performance_as_of_date
>       :toDate('yyyyMMdd')
>       :format('yyyy-MM-dd')
>       }, 
>     #{expression.end_of_last_month})
>       :format('yyyy-MM-dd')
>     }
>   )
> }
> {code}
> Essentially the Expression would unpack to something like below but instead I 
> get the raw text expression set to my attribute.
> {code:json}
> ${data_quality_performance_as_of_date
>   :isEmpty()
>   :not()
>   :ifElse(
>     ${data_quality_performance_as_of_date
>       :toDate('yyyyMMdd')
>       :format('yyyy-MM-dd')
>       }, 
>     ${now()
>       :toNumber()
>       :format('yyyy-MM-dd')
>       :toDate('yyyy-MM-dd', 'GMT')
>       :toNumber()
>       :minus(${
>         now()
>         :toNumber()
>         :format('dd')
>         :toNumber()
>         :multiply(86400)
>         :multiply(1000)
>       })
>       :format('yyyy-MM-dd')
>     }
>   )
> }
> {code}
> The result is here in some cases you can use parameters in this expression 
> but the desired outcome is not as expected unless



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