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https://issues.apache.org/jira/browse/PHOENIX-4639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Clive Stellings updated PHOENIX-4639:
-------------------------------------
    Description: When attempting to use a UDF the code for evaluate never runs 
if the parameter for the UDF is null.  I wrote a function called isnull that is 
attempting to emulate the same function as in Mysql but when I enter null e.g. 
isnull(null) it returns with an empty value and when I check if the evaluate 
method actually runs, it never enters the method.  (was: When attempting to use 
a UDF the code for evaluate never runs if the parameter for the UDF is null.  I 
wrote a function called isnull that and am attempting to emulate the same 
function as in Mysql but when I enter null e.g. isnull(null) it returns with an 
empty value and when I check if the eva;iate method actually runs, it never 
enters the method.)

> Udf's don't run execute method when using null as a parameter.
> --------------------------------------------------------------
>
>                 Key: PHOENIX-4639
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-4639
>             Project: Phoenix
>          Issue Type: Bug
>    Affects Versions: 4.13.2-cdh5.11.2
>         Environment: Centos 7  using Cloudera
>            Reporter: Clive Stellings
>            Priority: Major
>         Attachments: IsNull.java
>
>
> When attempting to use a UDF the code for evaluate never runs if the 
> parameter for the UDF is null.  I wrote a function called isnull that is 
> attempting to emulate the same function as in Mysql but when I enter null 
> e.g. isnull(null) it returns with an empty value and when I check if the 
> evaluate method actually runs, it never enters the method.



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