Map type used as return type in UDFs not recognized at all times
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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
Fix For: 0.3.0
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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