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Apache MRQL 0.9.4-incubating 发布

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Apache MRQL 0.9.4-incubating 发布，此版本是第二个发布的版本，现已提供下载：

http://www.apache.org/dyn/closer.cgi/incubator/mrql

更新内容：

[MRQL-41 ] Post-release improvements
[MRQL-42] Fix bug in XML projections
[MRQL-44] Fix the map-reduce join for a complex reducer on map-reduce mode
[MRQL-46] MRQL does not build with Java 8
[MRQL-47] Fix various bugs for the Flink evaluation mode
[MRQL-48] Fix global variable bindings in Spark and Flink modes
[MRQL-50] Fix result dumping to a text file in Flink mode
[MRQL-51] Support for Spark 1.1.0
[MRQL-52] Fix Flink evaluation mode to pass all Junit tests
[MRQL-53] Fix processing of directories of text files in MapReduce mode
[MRQL-58] Fix config file and shell run scripts to support multiple HDFS users
[MRQL-60] Fix building dependencies for hadoop 1.x
[MRQL-61] Fix bug on select over union queries
[MRQL-62] Fix Map-Reduce mode on MultipleInput sources
[MRQL-67] Fix maven build errors for JDK 1.8

[MRQL-43] Add support for tracing
[MRQL-54] Adjust the split size of a map-reduce input file based on the number of requested nodes
[MRQL-55] Add support for Hadoop Sequence input format in flink mode
[MRQL-56] Improve total aggregations and repetitions with shared results in Flink mode
[MRQL-57] Make floating-point literals to be double instead of float