解决kylin报错：java.lang.ArrayIndexOutOfBoundsException: -1

报错信息：

-- ::, INFO  [pool--thread-] cli.DictionaryGeneratorCLI: : Building snapshot of ENERGON_DM.DM_DIAGNOSIS_FACT_SGYY_ROOT_SET_FLAG
-- ::, ERROR [pool--thread-] common.HadoopShellExecutable: : error execute HadoopShellExecutable{id=8188ef71-3bc6-4b9a-b87d-5559e3ea6b4a-, name=Bu
ild Dimension Dictionary, state=RUNNING}
java.lang.ArrayIndexOutOfBoundsException: -
        at org.apache.kylin.dict.lookup.SnapshotTable.takeSnapshot(SnapshotTable.java:)
        at org.apache.kylin.dict.lookup.SnapshotManager.buildSnapshot(SnapshotManager.java:)
        at org.apache.kylin.cube.CubeManager.buildSnapshotTable(CubeManager.java:)
        at org.apache.kylin.cube.cli.DictionaryGeneratorCLI.processSegment(DictionaryGeneratorCLI.java:)
        at org.apache.kylin.cube.cli.DictionaryGeneratorCLI.processSegment(DictionaryGeneratorCLI.java:)
        at org.apache.kylin.engine.mr.steps.CreateDictionaryJob.run(CreateDictionaryJob.java:)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:)
        at org.apache.kylin.engine.mr.common.HadoopShellExecutable.doWork(HadoopShellExecutable.java:)
        at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:)
        at org.apache.kylin.job.execution.DefaultChainedExecutable.doWork(DefaultChainedExecutable.java:)
        at org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:)
        at org.apache.kylin.job.impl.threadpool.DefaultScheduler$JobRunner.run(DefaultScheduler.java:)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:)
        at java.lang.Thread.run(Thread.java:)

解决：

meta中/table/下存在同名但大小写不同的两个table的meta， 这个meta文件里column的id起始为0，正常情况应该为1. kylin内部把表的meta存到一个hashmap里，key为大写的表名，不论原来是否为大写。在这个情况中小写的meta的内容把大写的meta内容覆盖了，查ID的时候有一个操作是把id值 - 1。如果原始的ID为0，-1之后就变成-1，然后就抛出上面的异常。

 

org.apache.kylin.dict.lookup.SnapshotTable:

org.apache.kylin.metadata.model.ColumnDesc:

问题meta:

ps: 类org.apache.kylin.metadata.model.ColumnDesc对应table中的一个column:

v.s.