[jira] [Resolved] (IMPALA-5529) Add additional function signatures for TRUNC()

["Matthew Jacobs (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-5529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthew Jacobs resolved IMPALA-5529.
------------------------------------
       Resolution: Fixed
    Fix Version/s: Impala 2.10.0

https://github.com/apache/incubator-impala/commit/15e6cf8fd03e3ae012435592f0bf4d6a64298099

> Add additional function signatures for TRUNC()
> ----------------------------------------------
>
>                 Key: IMPALA-5529
>                 URL: https://issues.apache.org/jira/browse/IMPALA-5529
>             Project: IMPALA
>          Issue Type: New Feature
>          Components: Frontend
>    Affects Versions: Impala 2.9.0
>            Reporter: Greg Rahn
>            Assignee: Jinchul Kim
>              Labels: built-in-function, newbie
>             Fix For: Impala 2.10.0
>
>
> As of Impala 2.9 the current definition of the TRUNC() function is
> {noformat}
> +-------------+--------------------------+-------------+---------------+
> | return type | signature                | binary type | is persistent |
> +-------------+--------------------------+-------------+---------------+
> | TIMESTAMP   | trunc(TIMESTAMP, STRING) | BUILTIN     | true          |
> +-------------+--------------------------+-------------+---------------+
> {noformat}
> The additional signatures to be added are:
> {noformat}
>       result      | function |        arguments
> ------------------+----------+-------------------------
>  DOUBLE PRECISION | TRUNC    | (DOUBLE PRECISION)
>  NUMERIC          | TRUNC    | (NUMERIC(ANY))
>  NUMERIC          | TRUNC    | (NUMERIC(ANY), INTEGER)
> {noformat}
> Examples
> {noformat}
> postgres=# select trunc(cast(42.999 as decimal(5,3)));
>  trunc
> -------
>     42
> postgres=# select trunc(cast(42.999 as decimal(5,3)),1);
>  trunc
> -------
>   42.9
> postgres=# select trunc(cast(42.999 as double precision));
>  trunc
> -------
>     42
> {noformat}
> References:
> - https://my.vertica.com/docs/8.1.x/HTML/index.htm#Authoring/SQLReferenceManual/Functions/Mathematical/TRUNC.htm
> - https://www.postgresql.org/docs/current/static/functions-math.html
> The return precision/scale for a decimal should be the same as the input.  For example, trunc(decimal(x,y)) should return decimal(x,y).



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