You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@pig.apache.org by "Xuefu Zhang (JIRA)" <ji...@apache.org> on 2010/08/26 19:51:53 UTC
[jira] Created: (PIG-1573) PIG shouldn't pass all input to a UDF if
the UDF specify no argument
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
Fix For: 0.9.0
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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
[jira] Assigned: (PIG-1573) PIG shouldn't pass all input to a UDF
if the UDF specify no argument
Posted by "Alan Gates (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/PIG-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan Gates reassigned PIG-1573:
-------------------------------
Assignee: Daniel Dai (was: Xuefu Zhang)
> 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: 0.9.0
>
>
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
[jira] Assigned: (PIG-1573) PIG shouldn't pass all input to a UDF
if the UDF specify no argument
Posted by "Xuefu Zhang (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/PIG-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xuefu Zhang reassigned PIG-1573:
--------------------------------
Assignee: Xuefu Zhang
> 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: Xuefu Zhang
> Fix For: 0.9.0
>
>
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.