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https://issues.apache.org/jira/browse/TRAFODION-2208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15492891#comment-15492891
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ASF GitHub Bot commented on TRAFODION-2208:
-------------------------------------------

Github user traflm commented on a diff in the pull request:

    https://github.com/apache/incubator-trafodion/pull/703#discussion_r78925378
  
    --- Diff: core/sql/exp/exp_math_func.cpp ---
    @@ -348,7 +349,18 @@ ex_expr::exp_return_type ExFunctionMath::eval(char 
*op_data[],
          return ex_expr::EXPR_ERROR;
        }
           
    -      *(double *)op_data[0] = MathLog10(*(double *)op_data[1], err);
    +      *(double *)op_data[0] = MathLog2(*(double *)op_data[1], err);
    --- End diff --
    
    oops, yes. Sorry about this bug.


> function support: log2,IS_IPV4,IS_IPV6 etc
> ------------------------------------------
>
>                 Key: TRAFODION-2208
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-2208
>             Project: Apache Trafodion
>          Issue Type: Sub-task
>            Reporter: liu ming
>            Assignee: liu ming
>
> add built-in function 
> IS_IPV4
> IS_IPV6
> LOG2
> Also try to enhance the least to accept multiple input arguments which is 
> required in both Oracle/MySQL.
> This will be an example about how to add new built-in functions, so start 
> with some very simple functions.
> One of the important goal is to guide the following developing works.



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