[
https://issues.apache.org/jira/browse/HIVE-471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830431#action_12830431
]
Paul Yang commented on HIVE-471:
--------------------------------
Question about the patch - for className and methodName in evaluate(), it looks
like we are making a copy of the object and the object inspector so we can use
ObjectInspectorUtils.compare(). But since we know that the class name and
method name arguments are inspectable by a StringObjectInspector, can't we
save the the name of the class/method as a java string and check for equality
with '=='?
> A UDF for simple reflection
> ---------------------------
>
> Key: HIVE-471
> URL: https://issues.apache.org/jira/browse/HIVE-471
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Affects Versions: 0.6.0
> Reporter: Edward Capriolo
> Assignee: Edward Capriolo
> Priority: Minor
> Attachments: hive-471-gen.diff, HIVE-471.1.patch, hive-471.diff
>
>
> There are many methods in java that are static and have no arguments or can
> be invoked with one simple parameter. More complicated functions will require
> a UDF but one generic one can work as a poor-mans UDF.
> {noformat}
> SELECT reflect("java.lang.String", "valueOf", 1), reflect("java.lang.String",
> "isEmpty")
> FROM src LIMIT 1;
> {noformat}
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
