Apache Hive 0.11 版本分析
目前Hive 0.11 版本已经发本，本文旨在分析0.11的新特性。Bug 修复：（我个人遇到很多）
Hive 0.11版修复了hive本身存在的数10处bug，重点包括：
- Hive server is SHUTTING DOWN when invalid queries beeing executed
- If all of the parameters of distinct functions are exists in group by columns, query fails in runtime
- Hive compile errors under Java 7 (JDBC 4.1)
- Mixing avro and snappy gives null values
- HiveMetaStoreFsImpl is not compatible with hadoop viewfs
从中可以发现hive 与 jdk 1.7还是有很多的问题有待解决，所以目前还是不要尝试为好。
同时有很多新的特性，比如nvl 函数等，我们在实际应用中可以使用
- Implement TRUNCATE
- Implement HiveServer2
- Add Operator level Hooks
- when output hive table to file,users should could have a separator of their own choice
- when output hive table to file,users should could have a separator of their own choice
- Add DECIMAL data type
- Adding the oracle nvl function to the UDF
- HIVE-3552 performant manner for performing cubes/rollups/grouping sets for a high number of grouping set keys
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