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https://issues.apache.org/jira/browse/IMPALA-7740?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Rodoni reassigned IMPALA-7740:
-----------------------------------
Assignee: Alex Rodoni
> 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
>
> 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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