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static optimizer::SEL_ARG *key_or(optimizer::RangeParameter *param, optimizer::SEL_ARG *key1, optimizer::SEL_ARG *key2);
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static bool eq_tree(optimizer::SEL_ARG* a, optimizer::SEL_ARG *b);
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bool optimizer::sel_trees_can_be_ored(const SEL_TREE& tree1, const SEL_TREE& tree2, const RangeParameter& param)
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/* trees have a common key, check if they refer to same key part */