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Boaz Ben-Zvi created DRILL-6475:
-----------------------------------

             Summary: Unnest: Null fieldId Pointer 
                 Key: DRILL-6475
                 URL: https://issues.apache.org/jira/browse/DRILL-6475
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Relational Operators
            Reporter: Boaz Ben-Zvi
            Assignee: Parth Chandra
             Fix For: 1.14.0


 Executing the following (in TestE2EUnnestAndLateral.java) causes an NPE as `fieldId` is
null in `schemaChanged()`: 

```

@Test
public void testMultipleBatchesLateral_twoUnnests() throws Exception {
 String sql = "SELECT t5.l_quantity FROM dfs.`lateraljoin/multipleFiles/` t, LATERAL " +
 "(SELECT t2.ordrs FROM UNNEST(t.c_orders) t2(ordrs)) t3(ordrs), LATERAL " +
 "(SELECT t4.l_quantity FROM UNNEST(t3.ordrs) t4(l_quantity)) t5";
 test(sql);
}

```

 

And the error is:

```

Error: SYSTEM ERROR: NullPointerException

Fragment 0:0

[Error Id: 25f42765-8f68-418e-840a-ffe65788e1e2 on 10.254.130.25:31020]

(java.lang.NullPointerException) null
 org.apache.drill.exec.physical.impl.unnest.UnnestRecordBatch.schemaChanged():381
 org.apache.drill.exec.physical.impl.unnest.UnnestRecordBatch.innerNext():199
 org.apache.drill.exec.record.AbstractRecordBatch.next():172
 org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.next():229
 org.apache.drill.exec.record.AbstractRecordBatch.next():119
 org.apache.drill.exec.physical.impl.join.LateralJoinBatch.prefetchFirstBatchFromBothSides():241
 org.apache.drill.exec.physical.impl.join.LateralJoinBatch.buildSchema():264
 org.apache.drill.exec.record.AbstractRecordBatch.next():152
 org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.next():229
 org.apache.drill.exec.record.AbstractRecordBatch.next():119
 org.apache.drill.exec.record.AbstractRecordBatch.next():109
 org.apache.drill.exec.record.AbstractUnaryRecordBatch.innerNext():63
 org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.innerNext():137
 org.apache.drill.exec.record.AbstractRecordBatch.next():172
 org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.next():229
 org.apache.drill.exec.record.AbstractRecordBatch.next():119
 org.apache.drill.exec.record.AbstractRecordBatch.next():109
 org.apache.drill.exec.record.AbstractUnaryRecordBatch.innerNext():63
 org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.innerNext():137
 org.apache.drill.exec.record.AbstractRecordBatch.next():172
 org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.next():229
 org.apache.drill.exec.physical.impl.BaseRootExec.next():103
 org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.innerNext():83
 org.apache.drill.exec.physical.impl.BaseRootExec.next():93
 org.apache.drill.exec.work.fragment.FragmentExecutor$1.run():292
 org.apache.drill.exec.work.fragment.FragmentExecutor$1.run():279
 java.security.AccessController.doPrivileged():-2
 javax.security.auth.Subject.doAs():422
 org.apache.hadoop.security.UserGroupInformation.doAs():1657
 org.apache.drill.exec.work.fragment.FragmentExecutor.run():279
 org.apache.drill.common.SelfCleaningRunnable.run():38
 java.util.concurrent.ThreadPoolExecutor.runWorker():1142
 java.util.concurrent.ThreadPoolExecutor$Worker.run():617
 java.lang.Thread.run():745 (state=,code=0)

```

 



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