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Posted to dev@pig.apache.org by "Olga Natkovich (JIRA)" <ji...@apache.org> on 2011/03/03 02:21:36 UTC
[jira] Updated: (PIG-1573) PIG shouldn't pass all input to a UDF if
the UDF specify no argument
[ https://issues.apache.org/jira/browse/PIG-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Olga Natkovich updated PIG-1573:
--------------------------------
Fix Version/s: 0.10
> PIG shouldn't pass all input to a UDF if the UDF specify no argument
> --------------------------------------------------------------------
>
> Key: PIG-1573
> URL: https://issues.apache.org/jira/browse/PIG-1573
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Xuefu Zhang
> Assignee: Daniel Dai
> Fix For: 0.10
>
>
> Currently If in a pig script user uses a UDF with no argument, PIG backend assumes that the UDF takes all input so at run time it passes all input as a tuple to the UDF. This assumption is incorrect, causing conceptual confusions. If a UDF takes all input, it can specify a star (*) as its argument. If it specify no argument at all, then we assume that it requires no input data.
> We need to differentiate no input and all input for a UDF. Thus, in case that a UDF specify no argument, backend should pass the UDF an empty tuple.
> See notes in PIG-1586 for more information.
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