hive 函数，
源码见 https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF
http://www.htsjk.com/hive/37595.html
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hive 函数， 源码见 https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF...
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