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Comment: add jira HIVE-3996 (thanks again, Vikram)

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The optimizer enhancements in Hive 0.11 focus on efficient processing of the joins needed in star schema configurations. The initial work was limited to star schema joins where all dimension tables after filtering and projecting fit into memory at the same time. Scenarios where only some of the dimension tables fit into memory are now implemented as well (HIVE-3996).

The join optimizations can be grouped into three parts:

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