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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