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The "Hive/LanguageManual/Transform" page has been changed by LarryOgrodnek. http://wiki.apache.org/hadoop/Hive/LanguageManual/Transform?action=diff&rev1=13&rev2=14 -------------------------------------------------- In the syntax, both ''MAP ...'' and ''REDUCE ...'' can be also written as ''SELECT TRANSFORM ( ... )''. There are actually no difference between these three. Hive runs the reduce script in the reduce task (instead of the map task) because of the ''clusterBy''/''distributeBy''/''sortBy'' clause in the inner query. - Please also see [[Hive/LanguageManual/SortBy|Sort By / Cluster By / Distribute By]] and Larry Ogrodnek's [http://dev.bizo.com/2009/10/hive-map-reduce-in-java.html|blog post]. + Please also see [[Hive/LanguageManual/SortBy|Sort By / Cluster By / Distribute By]] and Larry Ogrodnek's [[http://dev.bizo.com/2009/10/hive-map-reduce-in-java.html|blog post]]. {{{ clusterBy: CLUSTER BY colName (',' colName)*
