在定义为 DECIMAL（31,8） 的列中加载具有 NULL 的 ORC 外部表时，我遇到了有关 HIVE 的问题。看起来 hive 在加载后无法读取 ORC 文件，并且无法再查看该字段中具有 NULL 的记录。同一ORC文件中的其他记录可以正常读取。
这是最近才发生的，我们没有对HIVE版本进行任何更改。令人惊讶的是，以前加载到同一表中的 ORC 文件在 DECIMAL 字段中具有 NULL，可以毫无问题地进行查询。
我们正在使用 HIVE 1.2.1。HIVE吐出的完整堆栈跟踪如下，我已将实际的hdfs位置替换为
org.apache.hive.service.cli.HiveSQLException: java.io.IOException: java.io.IOException: Error reading file: <hdfs location>
at org.apache.hive.service.cli.operation.SQLOperation.getNextRowSet(SQLOperation.java:352)
at org.apache.hive.service.cli.operation.OperationManager.getOperationNextRowSet(OperationManager.java:220)
at org.apache.hive.service.cli.session.HiveSessionImpl.fetchResults(HiveSessionImpl.java:685)
at org.apache.hive.service.cli.CLIService.fetchResults(CLIService.java:454)
at org.apache.hive.service.cli.thrift.ThriftCLIService.FetchResults(ThriftCLIService.java:672)
at org.apache.hive.service.cli.thrift.TCLIService$Processor$FetchResults.getResult(TCLIService.java:1553)
at org.apache.hive.service.cli.thrift.TCLIService$Processor$FetchResults.getResult(TCLIService.java:1538)
at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
at org.apache.hive.service.auth.TSetIpAddressProcessor.process(TSetIpAddressProcessor.java:56)
at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:285)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: java.io.IOException: Error reading file: <hdfs location>
at org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:507)
at org.apache.hadoop.hive.ql.exec.FetchOperator.pushRow(FetchOperator.java:414)
at org.apache.hadoop.hive.ql.exec.FetchTask.fetch(FetchTask.java:140)
at org.apache.hadoop.hive.ql.Driver.getResults(Driver.java:1670)
at org.apache.hive.service.cli.operation.SQLOperation.getNextRowSet(SQLOperation.java:347)
... 13 more
Caused by: java.io.IOException: Error reading file: <hdfs location>
at org.apache.hadoop.hive.ql.io.orc.RecordReaderImpl.next(RecordReaderImpl.java:1051)
at org.apache.hadoop.hive.ql.io.orc.OrcRawRecordMerger$OriginalReaderPair.next(OrcRawRecordMerger.java:263)
at org.apache.hadoop.hive.ql.io.orc.OrcRawRecordMerger.next(OrcRawRecordMerger.java:547)
at org.apache.hadoop.hive.ql.io.orc.OrcInputFormat$1.next(OrcInputFormat.java:1235)
at org.apache.hadoop.hive.ql.io.orc.OrcInputFormat$1.next(OrcInputFormat.java:1219)
at org.apache.hadoop.hive.ql.io.orc.OrcInputFormat$NullKeyRecordReader.next(OrcInputFormat.java:1151)
at org.apache.hadoop.hive.ql.io.orc.OrcInputFormat$NullKeyRecordReader.next(OrcInputFormat.java:1137)
at org.apache.hadoop.hive.ql.exec.FetchOperator.getNextRow(FetchOperator.java:474)
... 17 more
Caused by: java.io.EOFException: Reading BigInteger past EOF from compressed stream Stream for column 6 kind DATA position: 201 length: 201 range: 0 offset: 289 limit: 289 range 0 = 0 to 201 uncompressed: 362 to 362
at org.apache.hadoop.hive.ql.io.orc.SerializationUtils.readBigInteger(SerializationUtils.java:176)
at org.apache.hadoop.hive.ql.io.orc.TreeReaderFactory$DecimalTreeReader.next(TreeReaderFactory.java:1264)
at org.apache.hadoop.hive.ql.io.orc.TreeReaderFactory$StructTreeReader.next(TreeReaderFactory.java:2004)
at org.apache.hadoop.hive.ql.io.orc.RecordReaderImpl.next(RecordReaderImpl.java:1044)
... 24 more
在代码中设置它hive.fetch.task.conversion=none