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From "Scott Lewis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5466) Add support for SQL Standard statistics functions, such as STDDEV_POP, STDDEV_SAMP, VAR_POP, VAR_SAMP
Date Fri, 24 Jul 2015 20:54:05 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641055#comment-14641055
] 

Scott Lewis commented on DERBY-5466:
------------------------------------

Hi Rick.

Sure, I'm up for 3.  I assume the first thing would be to move my impl classes to org.apache.derby.impl.sql.execute
package.   I'm doing a bit of traveling next week, so I'll plan on doing that offline/locally
and then attaching as svn patch when I return.   Sound good?  LMK if I should do something
else while offline from 7/28-8/1.  Thanks.  

BTW, I submitted my ICLA to Apache Foundation secretary today so that's now in process.

> Add support for SQL Standard statistics functions, such as STDDEV_POP, STDDEV_SAMP, VAR_POP,
VAR_SAMP
> -----------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-5466
>                 URL: https://issues.apache.org/jira/browse/DERBY-5466
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.8.1.2
>            Reporter: Lukas Eder
>            Priority: Minor
>              Labels: derby_triage10_10
>
> Any of these RDBMS support the SQL standard statistics functions STDDEV_POP, STDDEV_SAMP,
VAR_POP, VAR_SAMP:
> - DB2 (only STDDEV, VARIANE)
> - H2 
> - HSQLDB 
> - Ingres 
> - MySQL 
> - Oracle 
> - Postgres 
> - SQL Server (named STDEVP, STDEV, VARP, VAR)
> - Sybase ASE
> - Sybase SQL Anywhere
> These don't:
> - Derby
> - SQLite
> This would be a useful addition for Derby, I think.
> An even larger example list of possible statistics aggregate functions is listed in the
Postgres documentation:
> http://www.postgresql.org/docs/9.0/static/functions-aggregate.html#FUNCTIONS-AGGREGATE-STATISTICS-TABLE



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