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Posted to dev@hive.apache.org by "Edward Capriolo (JIRA)" <ji...@apache.org> on 2010/05/24 02:43:24 UTC
[jira] Updated: (HIVE-471) A UDF for simple reflection
[ https://issues.apache.org/jira/browse/HIVE-471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Edward Capriolo updated HIVE-471:
---------------------------------
Fix Version/s: 0.6.0
Affects Version/s: 0.5.1
(was: 0.6.0)
Should be good for trunk.
> 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: 0.5.1
> Reporter: Edward Capriolo
> Assignee: Edward Capriolo
> Priority: Minor
> Fix For: 0.6.0
>
> Attachments: hive-471-gen.diff, HIVE-471.1.patch, HIVE-471.2.patch, HIVE-471.3.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}
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