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https://issues.apache.org/jira/browse/HIVE-6327?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13887230#comment-13887230
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Jason Dere commented on HIVE-6327:
----------------------------------
{quote}
In general though, this is not true: we cannot just treat decimal as double in
every case.
{quote}
Is this true? I thought the point of FunctionRegistry.getMethodInternal() was
to find best matching method signature given the arguments, while doing type
conversion if necessary. I would think that double/decimal would be a good
match for one another, if there isn't a signature that matches the param
exactly.
> A few mathematic functions don't take decimal input
> ---------------------------------------------------
>
> Key: HIVE-6327
> URL: https://issues.apache.org/jira/browse/HIVE-6327
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 0.11.0, 0.12.0
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
>
> A few mathematical functions, such as sin() cos(), etc. don't take decimal as
> argument.
> {code}
> hive> show tables;
> OK
> Time taken: 0.534 seconds
> hive> create table test(d decimal(5,2));
> OK
> Time taken: 0.351 seconds
> hive> select sin(d) from test;
> FAILED: SemanticException [Error 10014]: Line 1:7 Wrong arguments 'd': No
> matching method for class org.apache.hadoop.hive.ql.udf.UDFSin with
> (decimal(5,2)). Possible choices: _FUNC_(double)
> {code}
> HIVE-6246 covers only sign() function. The remaining ones, including sin,
> cos, tan, asin, acos, atan, exp, ln, log, log10, log2, radians, and sqrt.
> These are non-generic UDFs.
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