[jira] [Closed] (IMPALA-7740) Incorrect doc description for nvl2()

["Alex Rodoni (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-7740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Rodoni closed IMPALA-7740.
-------------------------------
       Resolution: Fixed
    Fix Version/s: Impala 3.1.0

> Incorrect doc description for nvl2()
> ------------------------------------
>
>                 Key: IMPALA-7740
>                 URL: https://issues.apache.org/jira/browse/IMPALA-7740
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Docs
>    Affects Versions: Impala 3.0
>            Reporter: Paul Rogers
>            Assignee: Alex Rodoni
>            Priority: Major
>             Fix For: Impala 3.1.0
>
>
> Impala offers the NVL2() function from [Oracle|https://docs.oracle.com/cd/B28359_01/olap.111/b28126/dml_functions_2049.htm#OLADM625]. A clearer definition is [here|https://www.techonthenet.com/oracle/functions/nvl2.php]:
> {quote}
> The syntax for the NVL2 function in Oracle/PLSQL is:
> {{NVL2( string1, value_if_not_null, value_if_null )}}
> {quote}
> Contrast that with the [Impala description|https://impala.apache.org/docs/build3x/html/topics/impala_conditional_functions.html]:
> {quote}
> Enhanced variant of the nvl() function. Tests an expression and returns different result values depending on whether it is NULL or not. _If the first argument is NULL, returns the second argument. If the first argument is not NULL, returns the third argument._ Equivalent to the nvl2() function from Oracle Database.
> {quote}
> (Emphasis added.) The description is exactly backward. To see this:
> {noformat}
> select n, nvl2(n, 10, 20) from ints;
> +------+---------------------------+
> | n    | if(n is not null, 10, 20) |
> +------+---------------------------+
> | NULL | 20                        |
> | 0    | 10                        |
> +------+---------------------------+
> {noformat}
> Hence, the implementation follows Oracle, the documentation is wrong.



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