spark定製之四：完整的start.scala

從HDFS中讀入，並定義內存表person："create table person (name string,age int,weight double)" from "hdfs:/test/testperson"java 用sql語句計算查詢，結果直接寫入文件（能夠是本地能夠是hdfs）："select avg(age) from person" hqlsaveto "averageage.t

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