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https://issues.apache.org/jira/browse/PHOENIX-1715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14355410#comment-14355410
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Shuxiong Ye commented on PHOENIX-1715:
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Integer Types byte-based sign function finish, while Float Types are a little
complex.
A solution for float types will be
1. If sign bit is minus, just return -1
2. Compare the contents with pre-compute-zero-bytes. if they are same, return 0
3. Other case, return 1.
I will try it tomorrow.
> Implement Build-in math function Sign
> -------------------------------------
>
> Key: PHOENIX-1715
> URL: https://issues.apache.org/jira/browse/PHOENIX-1715
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: Shuxiong Ye
> Assignee: Shuxiong Ye
>
> 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
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