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https://issues.apache.org/jira/browse/HIVE-22352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17183003#comment-17183003
]
chenruotao commented on HIVE-22352:
-----------------------------------
maybe you should try to set hive.sql.query.fieldNames=id,date and set
hive.sql.query.fieldTypes=int,timestamp
or update the ext table column name col1 to id and col2 to date
> Hive JDBC Storage Handler, simple select query failed with NPE if executed
> using Fetch Task
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-22352
> URL: https://issues.apache.org/jira/browse/HIVE-22352
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 3.1.1
> Environment: Hive-3.1
> Reporter: Rajkumar Singh
> Priority: Blocker
>
> Steps To Repro:
>
> {code:java}
> // MySQL Table
> CREATE TABLE `visitors` ( `id` bigint(20) unsigned NOT NULL, `date` timestamp
> NOT NULL DEFAULT CURRENT_TIMESTAMP )
> // hive table
> CREATE EXTERNAL TABLE `hive_visitors`( `col1` bigint COMMENT 'from
> deserializer', `col2` timestamp COMMENT 'from deserializer') ROW FORMAT SERDE
> 'org.apache.hive.storage.jdbc.JdbcSerDe' STORED BY
> 'org.apache.hive.storage.jdbc.JdbcStorageHandler' WITH SERDEPROPERTIES (
> 'serialization.format'='1') TBLPROPERTIES ( 'bucketing_version'='2',
> 'hive.sql.database.type'='MYSQL', 'hive.sql.dbcp.maxActive'='1',
> 'hive.sql.dbcp.password'='hive', 'hive.sql.dbcp.username'='hive',
> 'hive.sql.jdbc.driver'='com.mysql.jdbc.Driver',
> 'hive.sql.jdbc.url'='jdbc:mysql://hostname/test',
> 'hive.sql.table'='visitors', 'transient_lastDdlTime'='1554910389')
> Query:
> select * from hive_visitors ;
> Exception:
> 2019-10-16T04:04:39,483 WARN [HiveServer2-Handler-Pool: Thread-71]:
> thrift.ThriftCLIService (:()) - Error fetching results:
> org.apache.hive.service.cli.HiveSQLException: java.io.IOException:
> java.lang.NullPointerException at
> org.apache.hive.service.cli.operation.SQLOperation.getNextRowSet(SQLOperation.java:478)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> org.apache.hive.service.cli.operation.OperationManager.getOperationNextRowSet(OperationManager.java:328)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> org.apache.hive.service.cli.session.HiveSessionImpl.fetchResults(HiveSessionImpl.java:952)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source) ~[?:?] at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> ~[?:1.8.0_112] at java.lang.reflect.Method.invoke(Method.java:498)
> ~[?:1.8.0_112] at
> org.apache.hive.service.cli.session.HiveSessionProxy.invoke(HiveSessionProxy.java:78)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> org.apache.hive.service.cli.session.HiveSessionProxy.access$000(HiveSessionProxy.java:36)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> org.apache.hive.service.cli.session.HiveSessionProxy$1.run(HiveSessionProxy.java:63)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_112] at
> javax.security.auth.Subject.doAs(Subject.java:422) ~[?:1.8.0_112] at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1730)
> ~[hadoop-common-3.1.1.3.1.4.0-315.jar:?] at
> org.apache.hive.service.cli.session.HiveSessionProxy.invoke(HiveSessionProxy.java:59)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> com.sun.proxy.$Proxy42.fetchResults(Unknown Source) ~[?:?] at
> org.apache.hive.service.cli.CLIService.fetchResults(CLIService.java:565)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> org.apache.hive.service.cli.thrift.ThriftCLIService.FetchResults(ThriftCLIService.java:792)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> org.apache.hive.service.rpc.thrift.TCLIService$Processor$FetchResults.getResult(TCLIService.java:1837)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hive.service.rpc.thrift.TCLIService$Processor$FetchResults.getResult(TCLIService.java:1822)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hive.service.auth.TSetIpAddressProcessor.process(TSetIpAddressProcessor.java:56)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:286)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> ~[?:1.8.0_112] at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> ~[?:1.8.0_112] at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112] Caused
> by: java.io.IOException: java.lang.NullPointerException at
> org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:602)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hadoop.hive.ql.exec.FetchOperator.pushRow(FetchOperator.java:509)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:146)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hadoop.hive.ql.Driver.getResults(Driver.java:2739)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hadoop.hive.ql.reexec.ReExecDriver.getResults(ReExecDriver.java:229)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hive.service.cli.operation.SQLOperation.getNextRowSet(SQLOperation.java:473)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] ... 24 more Caused
> by: java.lang.NullPointerException at
> org.apache.hive.storage.jdbc.JdbcSerDe.deserialize(JdbcSerDe.java:164)
> ~[hive-jdbc-handler-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315] at
> org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:583)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hadoop.hive.ql.exec.FetchOperator.pushRow(FetchOperator.java:509)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:146)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hadoop.hive.ql.Driver.getResults(Driver.java:2739)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hadoop.hive.ql.reexec.ReExecDriver.getResults(ReExecDriver.java:229)
> ~[hive-exec-3.1.0.3.1.4.0-315.jar:3.1.1000-SNAPSHOT] at
> org.apache.hive.service.cli.operation.SQLOperation.getNextRowSet(SQLOperation.java:473)
> ~[hive-service-3.1.0.3.1.4.0-315.jar:3.1.0.3.1.4.0-315]
>
> {code}
>
> setting fetch.task.conversion=none avoids NPE and yield correct results, the
> column key lookup failed because of hashcode mismatch and value set to NULL.
> [https://github.com/apache/hive/blob/master/jdbc-handler/src/main/java/org/apache/hive/storage/jdbc/JdbcSerDe.java#L158]
>
> jdbc Iterator has right hive column names (col1,col2), the MapWritable has
> Text(col0) as key
> [https://github.com/apache/hive/blob/dcfa17cea2198bcaa483e3d92f62db9c642f14f6/jdbc-handler/src/main/java/org/apache/hive/storage/jdbc/dao/JdbcRecordIterator.java#L63]
>
> while the JdbcSerDe org.apache.hive.storage.jdbc.JdbcSerDe#hiveColumnNames
> has incorrect mapping , the columnKey created at
> org/apache/hive/storage/jdbc/JdbcSerDe.java:157 is Text(id) where id is
> column name for mysql not hive, opened another Jira HIVE-22353 for this
> invalid reference issue.
>
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