[jboss-jira] [JBoss JIRA] (DROOLS-1242) built-in accumulate functions shall ignore NULLs

[Matteo Mortari (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-1242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matteo Mortari updated DROOLS-1242:
-----------------------------------
    Description: 
This is a spin-off out of another problem [here|https://issues.jboss.org/browse/GUVNOR-2589?focusedCommentId=13268928&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13268928] for a proposal of improvement.

It could actually be beneficial for built-in accumulate functions to ignore NULLs.

This would be similar behavior of other languages such:
* SQL (e.g.: MySQL, Oracle, ..)
* Clojure

Currently it is up to the rule author to put a guarding condition in the first accumulate {{<source pattern>}} to manually ignore null sources to avoid the built-in accumulate functions to break trying to accumulate on NULLs.

  was:
This is a spin-off out of another problem [here|https://issues.jboss.org/browse/GUVNOR-2589?focusedCommentId=13268928&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13268928] for a proposal of improvement.

It could actually be beneficial for built-in accumulate functions to ignore NULLs.

This would be similar behavior of other languages such:
* SQL (e.g.: MySQL, Oracle, ..)
* Clojure

Currently it is up to the rule author to put a guarding condition in the first accumulate {{<source pattern>}} to manually ignore null sources to avoid the built-in accumulate functions to ignore NULLs.



> built-in accumulate functions shall ignore NULLs
> ------------------------------------------------
>
>                 Key: DROOLS-1242
>                 URL: https://issues.jboss.org/browse/DROOLS-1242
>             Project: Drools
>          Issue Type: Enhancement
>          Components: core engine
>            Reporter: Matteo Mortari
>            Assignee: Matteo Mortari
>            Priority: Optional
>
> This is a spin-off out of another problem [here|https://issues.jboss.org/browse/GUVNOR-2589?focusedCommentId=13268928&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13268928] for a proposal of improvement.
> It could actually be beneficial for built-in accumulate functions to ignore NULLs.
> This would be similar behavior of other languages such:
> * SQL (e.g.: MySQL, Oracle, ..)
> * Clojure
> Currently it is up to the rule author to put a guarding condition in the first accumulate {{<source pattern>}} to manually ignore null sources to avoid the built-in accumulate functions to break trying to accumulate on NULLs.



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