最近在工作中，使用CASE WHEN语句的时候，总是出现异常，查看日志是由于数组超界。不知所以然，然后进行了一步步分析，发现这是hive本身的bug，分享出来，一是为了记录，二是想让大家共同看看，欢迎指正。
- 使用的是CDH5.14.0版本。
- CDH5.14.0使用的HIVE版本
- 自建日志表log：
+----------------------------------------------------+--+
| createtab_stmt |
+----------------------------------------------------+--+
| CREATE TABLE `log`( |
| `mandt` char(3), |
| `zdate` char(10), |
| `ztime` char(8), |
| `zguid` char(20), |
| `ztype` char(1), |
| `zfuncname` varchar(30), |
| `zseq` varchar(2), |
| `xmldata` string, |
| `xmldata2` string, |
| `field1` varchar(20), |
| `field2` varchar(20), |
| `field3` varchar(20), |
| `field4` varchar(20)) |
| CLUSTERED BY ( |
| zdate) |
| INTO 12 BUCKETS |
| ROW FORMAT SERDE |
| 'org.apache.hadoop.hive.ql.io.orc.OrcSerde' |
| WITH SERDEPROPERTIES ( |
| 'field.delim'=' ', |
| 'serialization.format'=' ') |
| STORED AS INPUTFORMAT |
| 'org.apache.hadoop.hive.ql.io.orc.OrcInputFormat' |
| OUTPUTFORMAT |
| 'org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat' |
| LOCATION |
| 'hdfs://hserver1n:8020/user/hive/warehouse/sap.db/log' |
| TBLPROPERTIES ( |
| 'COLUMN_STATS_ACCURATE'='true', |
| 'compactor.mapreduce.map.memory.mb'='1024', |
| 'compactorthreshold.hive.compactor.delta.num.threshold'='4', |
| 'compactorthreshold.hive.compactor.delta.pct.threshold'='0.5', |
| 'last_modified_by'='hdfs', |
| 'last_modified_time'='1522318887', |
| 'numFiles'='14', |
| 'numRows'='1000000', |
| 'rawDataSize'='0', |
| 'totalSize'='135774020', |
| 'transactional'='true', |
| 'transient_lastDdlTime'='1522393096') |
+----------------------------------------------------+--+
41 rows selected (0.105 seconds)
此表共有13个字段，存储格式是 ORC列式存储，共有12个桶，并启用了事务。
- 查询语句：
select zdate,case zdate when '2013.07.23' then 'a' else 'b' end as zfunc from log limit 1;
- 错误描述(日志太长，部分省略)：
Log Type: syslog
Log Upload Time: Tue Apr 03 17:09:14 +0800 2018
Log Length: 80385
2018-04-03 17:08:36,788 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator: Initializing Self MAP[4]
2018-04-03 17:08:36,788 INFO [main] org.apache.hadoop.hive.ql.exec.TableScanOperator: Initializing Self TS[0]
2018-04-03 17:08:36,788 INFO [main] org.apache.hadoop.hive.ql.exec.TableScanOperator: Operator 0 TS initialized
2018-04-03 17:08:36,788 INFO [main] org.apache.hadoop.hive.ql.exec.TableScanOperator: Initializing children of 0 TS
2018-04-03 17:08:36,788 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator: Initializing child 1 SEL
2018-04-03 17:08:36,788 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator: Initializing Self SEL[1]
2018-04-03 17:08:36,792 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator: Operator 1 SEL initialized
2018-04-03 17:08:36,792 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator: Initializing children of 1 SEL
2018-04-03 17:08:36,792 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorLimitOperator: Initializing child 2 LIM
2018-04-03 17:08:36,792 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorLimitOperator: Initializing Self LIM[2]
2018-04-03 17:08:36,792 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorLimitOperator: Operator 2 LIM initialized
2018-04-03 17:08:36,792 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorLimitOperator: Initializing children of 2 LIM
2018-04-03 17:08:36,792 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorFileSinkOperator: Initializing child 3 FS
2018-04-03 17:08:36,792 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorFileSinkOperator: Initializing Self FS[3]
2018-04-03 17:08:36,793 INFO [main] org.apache.hadoop.conf.Configuration.deprecation: mapred.task.id is deprecated. Instead, use mapreduce.task.attempt.id
2018-04-03 17:08:36,908 INFO [main] org.apache.hadoop.hive.ql.exec.FileSinkOperator: Using serializer : class org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe[[[B@5d13d4e]:[_col0, _col1]:[char(10), string]] and formatter : org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat@7e1b4e9d
2018-04-03 17:08:36,908 INFO [main] org.apache.hadoop.conf.Configuration.deprecation: mapred.healthChecker.script.timeout is deprecated. Instead, use mapreduce.tasktracker.healthchecker.script.timeout
2018-04-03 17:08:36,909 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorFileSinkOperator: Operator 3 FS initialized
2018-04-03 17:08:36,909 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorFileSinkOperator: Initialization Done 3 FS
2018-04-03 17:08:36,909 INFO [main] org.apache.hadoop.conf.Configuration.deprecation: mapred.task.is.map is deprecated. Instead, use mapreduce.task.ismap
2018-04-03 17:08:36,909 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorLimitOperator: Initialization Done 2 LIM
2018-04-03 17:08:36,909 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator: Initialization Done 1 SEL
2018-04-03 17:08:36,909 INFO [main] org.apache.hadoop.hive.ql.exec.TableScanOperator: Initialization Done 0 TS
2018-04-03 17:08:36,909 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator: Initialization Done 4 MAP
2018-04-03 17:08:38,231 FATAL [main] org.apache.hadoop.hive.ql.exec.mr.ExecMapper: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row
at org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:52)
at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:170)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:459)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1917)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Error evaluating CASE (zfuncname) WHEN ('ZFI_VENDOR_TO_CRM') THEN ('a') ELSE ('b') END
at org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator.processOp(VectorSelectOperator.java:126)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:815)
at org.apache.hadoop.hive.ql.exec.TableScanOperator.processOp(TableScanOperator.java:98)
at org.apache.hadoop.hive.ql.exec.MapOperator$MapOpCtx.forward(MapOperator.java:157)
at org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:45)
... 9 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 13
at org.apache.hadoop.hive.ql.exec.vector.udf.VectorUDFAdaptor.evaluate(VectorUDFAdaptor.java:117)
at org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator.processOp(VectorSelectOperator.java:124)
... 13 more
2018-04-03 17:08:38,231 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator: 4 finished. closing...
2018-04-03 17:08:38,231 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator: RECORDS_IN:0
2018-04-03 17:08:38,231 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator: DESERIALIZE_ERRORS:0
2018-04-03 17:08:38,231 INFO [main] org.apache.hadoop.hive.ql.exec.TableScanOperator: 0 finished. closing...
2018-04-03 17:08:38,231 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator: 1 finished. closing...
2018-04-03 17:08:38,231 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorLimitOperator: 2 finished. closing...
2018-04-03 17:08:38,231 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorFileSinkOperator: 3 finished. closing...
2018-04-03 17:08:38,231 INFO [main] org.apache.hadoop.hive.ql.exec.FileSinkOperator: FS[3]: records written - 0
2018-04-03 17:08:38,231 INFO [main] org.apache.hadoop.hive.ql.exec.FileSinkOperator: Final Path: FS hdfs://hserver1n:8020/tmp/hive/hdfs/e62bf883-074a-44b2-8b04-2b69d4475a66/hive_2018-04-03_17-08-17_236_6563852616584890762-25/-mr-10000/.hive-staging_hive_2018-04-03_17-08-17_236_6563852616584890762-25/_tmp.-ext-10001/000000_0
2018-04-03 17:08:38,232 INFO [main] org.apache.hadoop.hive.ql.exec.FileSinkOperator: Writing to temp file: FS hdfs://hserver1n:8020/tmp/hive/hdfs/e62bf883-074a-44b2-8b04-2b69d4475a66/hive_2018-04-03_17-08-17_236_6563852616584890762-25/-mr-10000/.hive-staging_hive_2018-04-03_17-08-17_236_6563852616584890762-25/_task_tmp.-ext-10001/_tmp.000000_0
2018-04-03 17:08:38,232 INFO [main] org.apache.hadoop.hive.ql.exec.FileSinkOperator: New Final Path: FS hdfs://hserver1n:8020/tmp/hive/hdfs/e62bf883-074a-44b2-8b04-2b69d4475a66/hive_2018-04-03_17-08-17_236_6563852616584890762-25/-mr-10000/.hive-staging_hive_2018-04-03_17-08-17_236_6563852616584890762-25/_tmp.-ext-10001/000000_0
2018-04-03 17:08:38,623 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorFileSinkOperator: RECORDS_OUT_0:0
2018-04-03 17:08:38,623 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorFileSinkOperator: 3 Close done
2018-04-03 17:08:38,623 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorLimitOperator: 2 Close done
2018-04-03 17:08:38,623 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator: 1 Close done
2018-04-03 17:08:38,623 INFO [main] org.apache.hadoop.hive.ql.exec.TableScanOperator: 0 Close done
2018-04-03 17:08:38,623 INFO [main] org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator: 4 Close done
2018-04-03 17:08:38,624 WARN [main] org.apache.hadoop.mapred.YarnChild: Exception running child : java.lang.RuntimeException: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row
at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:179)
at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:459)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1917)
at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while processing row
at org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:52)
at org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:170)
... 8 more
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Error evaluating CASE (zfuncname) WHEN ('ZFI_VENDOR_TO_CRM') THEN ('a') ELSE ('b') END
at org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator.processOp(VectorSelectOperator.java:126)
at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:815)
at org.apache.hadoop.hive.ql.exec.TableScanOperator.processOp(TableScanOperator.java:98)
at org.apache.hadoop.hive.ql.exec.MapOperator$MapOpCtx.forward(MapOperator.java:157)
at org.apache.hadoop.hive.ql.exec.vector.VectorMapOperator.process(VectorMapOperator.java:45)
... 9 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 13
at org.apache.hadoop.hive.ql.exec.vector.udf.VectorUDFAdaptor.evaluate(VectorUDFAdaptor.java:117)
at org.apache.hadoop.hive.ql.exec.vector.VectorSelectOperator.processOp(VectorSelectOperator.java:124)
... 13 more
2018-04-03 17:08:39,369 INFO [main] org.apache.hadoop.mapred.Task: Runnning cleanup for the task
2018-04-03 17:08:39,496 INFO [main] org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Stopping MapTask metrics system...
2018-04-03 17:08:39,496 INFO [main] org.apache.hadoop.metrics2.impl.MetricsSystemImpl: MapTask metrics system stopped.
2018-04-03 17:08:39,496 INFO [main] org.apache.hadoop.metrics2.impl.MetricsSystemImpl: MapTask metrics system shutdown complete.
错误分析：
日志给出的错误原因是13超过了数组的边界，猜想是系统认为总共有12桶，超过了桶的个数，故报错，后面进行验证。
故一步步排除，首先创建了一个简单的表：
0: jdbc:hive2://localhost:10000> create table log2(
. . . . . . . . . . . . . . . .> mandt char(3),
. . . . . . . . . . . . . . . .> zdate char(10),
. . . . . . . . . . . . . . . .> ztime char(8),
. . . . . . . . . . . . . . . .> zguid char(20),
. . . . . . . . . . . . . . . .> ztype char(1),
. . . . . . . . . . . . . . . .> zfuncname varchar(30),
. . . . . . . . . . . . . . . .> zseq varchar(2),
. . . . . . . . . . . . . . . .> xmldata string,
. . . . . . . . . . . . . . . .> xmldata2 string,
. . . . . . . . . . . . . . . .> field1 varchar(20),
. . . . . . . . . . . . . . . .> field2 varchar(20),
. . . . . . . . . . . . . . . .> field3 varchar(20),
. . . . . . . . . . . . . . . .> field4 varchar(20))
. . . . . . . . . . . . . . . .> row format delimited fields terminated by ' ';
然后将log数据库中部分数据导入到此表中，再使用上面查询语句查询(将数据库表名改成新建的表log2)，可以得到正确结果。
然后再在上面基础之上使用ORC方式存储，也可以得到正确结果；
然后在ORC基础之上，再使用分桶，也可以得到正确结果，可见并不是分桶的原因；
然后再分桶基础之上，再创建事务表，则会出现错误，可见此错误是由于使用了事务的原因。
为了验证后面的Hive版本是否已解决，下载了apache hive2.3.0版本测试了一下，已没有问题。