HIVE默认分区导致 Hive Internal Error: java.lang.NullP...

一条HIVE SQL抛出了异常：

select sessidmodex(sessid, 10),count(*),count(distinct sessid),count(distinct visitip)  from visitlogs where ((dt='2012-11-14' and vhour>=13) or (dt='2012-11-15' and vhour<13)) and refer like '%/guang/hot%' and parse_url(refer,'QUERY','page') is NULL and uri like '/share/%' and not is_spam(dt,sessid,'SESSID') group by sessidmodex(sessid, 10);

sessidmodex 是自己写的一个UDF。

FAILED: Hive Internal Error: java.lang.NullPointerException(null)
java.lang.NullPointerException
     at org.apache.hadoop.hive.ql.optimizer.pcr.PcrExprProcFactory.opAnd(PcrExprProcFactory.java:128)
     at org.apache.hadoop.hive.ql.optimizer.pcr.PcrExprProcFactory$GenericFuncExprProcessor.process(PcrExprProcFactory.java:267)
     at org.apache.hadoop.hive.ql.lib.DefaultRuleDispatcher.dispatch(DefaultRuleDispatcher.java:89)
     at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatch(DefaultGraphWalker.java:88)
     at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.walk(DefaultGraphWalker.java:125)
     at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.startWalking(DefaultGraphWalker.java:102)
     at org.apache.hadoop.hive.ql.optimizer.pcr.PcrExprProcFactory.walkExprTree(PcrExprProcFactory.java:450)
     at org.apache.hadoop.hive.ql.optimizer.pcr.PcrOpProcFactory$FilterPCR.process(PcrOpProcFactory.java:149)
     at org.apache.hadoop.hive.ql.lib.DefaultRuleDispatcher.dispatch(DefaultRuleDispatcher.java:89)
     at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatch(DefaultGraphWalker.java:88)
     at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.walk(DefaultGraphWalker.java:125)
     at org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.startWalking(DefaultGraphWalker.java:102)
     at org.apache.hadoop.hive.ql.optimizer.pcr.PartitionConditionRemover.transform(PartitionConditionRemover.java:78)
     at org.apache.hadoop.hive.ql.optimizer.Optimizer.optimize(Optimizer.java:87)
     at org.apache.hadoop.hive.ql.parse.SemanticAnalyzer.analyzeInternal(SemanticAnalyzer.java:7306)
     at org.apache.hadoop.hive.ql.parse.BaseSemanticAnalyzer.analyze(BaseSemanticAnalyzer.java:243)
     at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:430)
     at org.apache.hadoop.hive.ql.Driver.compile(Driver.java:337)
     at org.apache.hadoop.hive.ql.Driver.run(Driver.java:889)
     at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:255)
     at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:212)
     at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:403)
     at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:671)
     at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:554)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.lang.reflect.Method.invoke(Method.java:616)
     at org.apache.hadoop.util.RunJar.main(RunJar.java:156)

困惑的原因是这条SQL执行其他日期11.01的就没有错误，但是跑11.14的就会报错。

1.必然不是SQL的问题

2.可能是分区问题，从web 页面看下分区除了正常的日期和小时分区外多了一个：

dt=2012-11-14/vhour=__HIVE_DEFAULT_PARTITION__

drop 掉，从web页面看成功了。

3.再次执行，还是报错！Google一下，一个前辈抛出来的是由于UNION ALL http://scholers.iteye.com/blog/1677120 但是显然我没有用到UNION ALL

4.hive 命令行show partitions 一下，原来hive表中还是有这个分区，再drop 下，世界清净吧。

5.OK，SQL顺利执行！！