NPE in schema generation
------------------------
Key: PIG-1843
URL: https://issues.apache.org/jira/browse/PIG-1843
Project: Pig
Issue Type: Bug
Affects Versions: 0.8.0
Reporter: Daniel Dai
Assignee: Daniel Dai
Fix For: 0.9.0, 0.8.0
Hit NPE in following script:
{code}
a = load 'table_testBagDereferenceInMiddle2' as (a0:chararray);
b = foreach a generate MapGenerate(STRSPLIT(a0).$0));
{code}
{code}
public class MapGenerate extends EvalFunc<Map> {
@Override
public Map exec(Tuple input) throws IOException {
Map m = new HashMap();
m.put("key", new Integer(input.size()));
return m;
}
@Override
public Schema outputSchema(Schema input) {
return new Schema(new Schema.FieldSchema(getSchemaName("parselong",
input), DataType.MAP));
}
}
{code}
Error message:
Caused by: java.lang.NullPointerException
at org.apache.pig.EvalFunc.getSchemaName(EvalFunc.java:76)
at string.PARSELONG.outputSchema(PARSELONG.java:63)
at
org.apache.pig.newplan.logical.expression.UserFuncExpression.getFieldSchema(UserFuncExpression.java:154)
at
org.apache.pig.newplan.logical.optimizer.FieldSchemaResetter.execute(SchemaResetter.java:192)
at
org.apache.pig.newplan.logical.expression.AllSameExpressionVisitor.visit(AllSameExpressionVisitor.java:143)
at
org.apache.pig.newplan.logical.expression.UserFuncExpression.accept(UserFuncExpression.java:71)
at
org.apache.pig.newplan.ReverseDependencyOrderWalker.walk(ReverseDependencyOrderWalker.java:70)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:50)
at
org.apache.pig.newplan.logical.optimizer.SchemaResetter.visit(SchemaResetter.java:104)
at
org.apache.pig.newplan.logical.relational.LOGenerate.accept(LOGenerate.java:240)
at
org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
at
org.apache.pig.newplan.logical.optimizer.SchemaResetter.visit(SchemaResetter.java:93)
at
org.apache.pig.newplan.logical.relational.LOForEach.accept(LOForEach.java:73)
at
org.apache.pig.newplan.DependencyOrderWalker.walk(DependencyOrderWalker.java:75)
at org.apache.pig.newplan.PlanVisitor.visit(PlanVisitor.java:50)
at
org.apache.pig.backend.hadoop.executionengine.HExecutionEngine.compile(HExecutionEngine.java:279)
at org.apache.pig.PigServer.compilePp(PigServer.java:1480)
at org.apache.pig.PigServer.explain(PigServer.java:1042)
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