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The "Hive/Roadmap" page has been changed by TimArmstrong: http://wiki.apache.org/hadoop/Hive/Roadmap?action=diff&rev1=62&rev2=63 Comment: removed claim Priorities are denoted as P0 > P1 > ... === Query Optimization === - * [P0] Optimizing JOIN followed by GROUP BY (claimed by Tim Armstrong) + * [P0] Optimizing JOIN followed by GROUP BY * A lot of analytics queries are JOINs followed by GROUP BY (join keys and group by keys may or may not be the same or related). We need a better optimization for this kind of query (optimize number of MapReduce Jobs vs. optimize data transfer size etc.) * [P0] Optimize JOINs using Bloom Filters * This is to optimize the case where two big tables are joined but the results are small.
