Stamatis Zampetakis created HIVE-23532:
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Summary: NPE when fetching incomplete column statistics from the
metastore
Key: HIVE-23532
URL: https://issues.apache.org/jira/browse/HIVE-23532
Project: Hive
Issue Type: Bug
Reporter: Stamatis Zampetakis
Certain operations may store in the metastore incomplete column statistics.
Fetching those statistics back from the metastore leads to
{{NullPointerException}} .
For instance consider a column "name" of type string. If we do have statistics
for this column then the following info must be available:
* maxColLen;
* avgColLen;
* numNulls;
* numDVs;
Executing the following statement on a table with no stats updates a subset of
the statistics for this column:
{code:sql}
ALTER TABLE example UPDATE STATISTICS for column name SET ('numDVs'='242',
'numNulls'='5');
{code}
Fetching this kind of statistics leads to NPE that sometimes pops up in the
client and some other times is buried in the logs leading to incomplete column
stats during optimization and execution of a query.
Usually the stacktrace is similar to the one below:
{noformat}
org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.NullPointerException
at
org.apache.hadoop.hive.ql.metadata.Hive.getTableColumnStatistics(Hive.java:5251)
at
org.apache.hadoop.hive.ql.ddl.table.info.desc.DescTableOperation.getColumnDataColPathSpecified(DescTableOperation.java:216)
at
org.apache.hadoop.hive.ql.ddl.table.info.desc.DescTableOperation.execute(DescTableOperation.java:94)
at org.apache.hadoop.hive.ql.ddl.DDLTask.execute(DDLTask.java:80)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:213)
at
org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:105)
at org.apache.hadoop.hive.ql.Executor.launchTask(Executor.java:362)
at org.apache.hadoop.hive.ql.Executor.launchTasks(Executor.java:335)
at org.apache.hadoop.hive.ql.Executor.runTasks(Executor.java:246)
at org.apache.hadoop.hive.ql.Executor.execute(Executor.java:109)
at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:723)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:492)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:486)
at
org.apache.hadoop.hive.ql.reexec.ReExecDriver.run(ReExecDriver.java:164)
at
org.apache.hadoop.hive.ql.reexec.ReExecDriver.run(ReExecDriver.java:230)
at
org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:256)
at org.apache.hadoop.hive.cli.CliDriver.processCmd1(CliDriver.java:201)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:127)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:422)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:353)
at
org.apache.hadoop.hive.ql.QTestUtil.executeClientInternal(QTestUtil.java:730)
at org.apache.hadoop.hive.ql.QTestUtil.executeClient(QTestUtil.java:700)
at
org.apache.hadoop.hive.cli.control.CoreCliDriver.runTest(CoreCliDriver.java:170)
at
org.apache.hadoop.hive.cli.control.CliAdapter.runTest(CliAdapter.java:157)
at
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver(TestMiniLlapLocalCliDriver.java:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at
org.apache.hadoop.hive.cli.control.CliAdapter$2$1.evaluate(CliAdapter.java:135)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runners.Suite.runChild(Suite.java:127)
at org.junit.runners.Suite.runChild(Suite.java:26)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at
org.apache.hadoop.hive.cli.control.CliAdapter$1$1.evaluate(CliAdapter.java:95)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at
org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
at
org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
at
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
at
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
at
org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:379)
at
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:340)
at
org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:125)
at
org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:413)
Caused by: java.lang.NullPointerException
at
org.apache.hadoop.hive.metastore.RetryingMetaStoreClient.invoke(RetryingMetaStoreClient.java:236)
at com.sun.proxy.$Proxy62.getTableColumnStatistics(Unknown Source)
at
org.apache.hadoop.hive.ql.metadata.Hive.getTableColumnStatistics(Hive.java:5246)
... 61 more
{noformat}
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