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https://issues.apache.org/jira/browse/PIG-1030?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard Ding updated PIG-1030:
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Attachment: PIG-1030.patch
The problem is that the code assums to combine only in the case where there is
only one PODistinct which is the only input to an aggregate function. This
patch disables the combiner if an aggregate function in foreach statements have
multiple inputs and one of them is PODistinct.
> explain and dump not working with two UDFs inside inner plan of foreach
> -----------------------------------------------------------------------
>
> Key: PIG-1030
> URL: https://issues.apache.org/jira/browse/PIG-1030
> Project: Pig
> Issue Type: Bug
> Reporter: Ying He
> Assignee: Richard Ding
> Attachments: PIG-1030.patch
>
>
> this scprit does not work
> register /homes/yinghe/owl/string.jar;
> a = load '/user/yinghe/a.txt' as (id, color);
> b = group a all;
> c = foreach b {
> d = distinct a.color;
> generate group, string.BagCount2(d), string.ColumnLen2(d, 0);
> }
> the udfs are regular, not algebraic.
> then if I call "dump c;" or "explain c", I would get this error message.
> ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2019: Expected to find plan
> with single leaf. Found 2 leaves.
> The error only occurs for the first time, after getting this error, if I call
> "dump c" or "explain c" again, it would succeed.
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