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From "Rick Hillegas (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 Sat, 25 Jul 2015 15:43:04 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641701#comment-14641701
] 

Rick Hillegas commented on DERBY-5466:
--------------------------------------

Thanks, Scott. Yes, that sounds like the right first step. You will notice that a new hurdle
was recently added to the top level "buildjars" ant target, the target which builds the jar
files. When the contents of the jar files change, a list must be updated. The "jardriftcheck"
target will tell you what the discrepancies are and the "refreshjardriftcheck" will update
the list. You may not trip across this at first, however. That is because your code won't
be pulled into the jar files until it is referenced by other code which is already in the
jars.

I see that Craig has acknowledged receipt of your ICLA, so we can accept your contributions.

Welcome!
-Rick

> 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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