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[SQL]Extract the joinkeys from join condition
Extract the join keys from equality conditions, that can be evaluated using equi-join. Author: Cheng Hao <hao.cheng@intel.com> Closes apache#1190 from chenghao-intel/extract_join_keys and squashes the following commits: 4a1060a [Cheng Hao] Fix some of the small issues ceb4924 [Cheng Hao] Remove the redundant pattern of join keys extraction cec34e8 [Cheng Hao] Update the code style issues dcc4584 [Cheng Hao] Extract the joinkeys from join condition
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