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https://issues.apache.org/jira/browse/PIG-851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olga Natkovich updated PIG-851:
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Status: Open (was: Patch Available)
> Map type used as return type in UDFs not recognized at all times
> ----------------------------------------------------------------
>
> Key: PIG-851
> URL: https://issues.apache.org/jira/browse/PIG-851
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.3.0
> Reporter: Santhosh Srinivasan
> Assignee: Jeff Zhang
> Fix For: 0.4.0
>
> Attachments: Pig_851_patch.txt
>
>
> When an UDF returns a map and the outputSchema method is not overridden, Pig
> does not figure out the data type. As a result, the type is set to unknown
> resulting in run time failure. An example script and UDF follow
> {code}
> public class mapUDF extends EvalFunc<Map<Object, Object>> {
> @Override
> public Map<Object, Object> exec(Tuple input) throws IOException {
> return new HashMap<Object, Object>();
> }
> //Note that the outputSchema method is commented out
> /*
> @Override
> public Schema outputSchema(Schema input) {
> try {
> return new Schema(new Schema.FieldSchema(null, null,
> DataType.MAP));
> } catch (FrontendException e) {
> return null;
> }
> }
> */
> {code}
> {code}
> grunt> a = load 'student_tab.data';
> grunt> b = foreach a generate EXPLODE(1);
> grunt> describe b;
> b: {Unknown}
> grunt> dump b;
> 2009-06-15 17:59:01,776 [main] INFO
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
> - Failed!
> 2009-06-15 17:59:01,781 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 2080: Foreach currently does not handle type Unknown
> {code}
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