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https://issues.apache.org/jira/browse/PHOENIX-1660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14327919#comment-14327919
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Aakarsh Agarwal commented on PHOENIX-1660:
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Hi James,
Thanks for replying so soon. I got what u mentioned in your comment. I need to
first go through the codes of classes and grammar file you mentioned in ordet
to get hang of it and then implement a built in function.
In the original desciption, it is only mentioned how to create a new class for
the implementation of built-in functions. I think I need to first fork the
original existing code from Github and then implement and add a new class to
it.Is it so?
To add, will you recommend any particular built-in function that may be easy to
implement as was the case with REVERSE function, or I may start with any of
those mentioned in the original document?
Regards
Aakarsh Agarwal
> 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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