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https://issues.apache.org/jira/browse/PHOENIX-1660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14327940#comment-14327940
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James Taylor commented on PHOENIX-1660:
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You'll want to start by:
- cloning our github mirror repo: http://phoenix.apache.org/source.html
- understanding the basic workflow for contributing:
http://phoenix.apache.org/contributing.html
- setting up your dev environment: http://phoenix.apache.org/develop.html
- file a sub-task JIRA under this one with the particular math built-in
function you plan to implement (so that we don't have overlap with others).
FWIW, you won't need to change the grammar or deal with any of those classes I
mentioned (other than deriving a class from ScalarFunction which implements
Expression). Give it a shot and follow those instructions here:
http://phoenix-hbase.blogspot.com/2013/04/how-to-add-your-own-built-in-function.html
> Implement missing math built-in functions
> -----------------------------------------
>
> Key: PHOENIX-1660
> URL: https://issues.apache.org/jira/browse/PHOENIX-1660
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Labels: Java, SQL, gsoc2015, mentor
>
> Take a look at the typical math functions that are implemented in relational
> database systems
> (http://www.postgresql.org/docs/current/static/functions-math.html) and
> implement the same for Phoenix in Java following this guide:
> http://phoenix-hbase.blogspot.com/2013/04/how-to-add-your-own-built-in-function.html
> Examples of missing functions include POWER, LOG, EXP, SQRT, CBRT, etc. As a
> guide, examine how ROUND is implemented in Phoenix as an abstract function
> with concrete functions per type: long, decimal, and date/time types.
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