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key_map index_join[INDEX_HINT_FORCE + 1];
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key_map index_order[INDEX_HINT_FORCE + 1];
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key_map index_group[INDEX_HINT_FORCE + 1];
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bool have_empty_use_join= false, have_empty_use_order= false,
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have_empty_use_group= false;
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159
List_iterator <Index_hint> iter(index_hints->begin());
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/* initialize temporary variables used to collect hints of each kind */
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index_join[type].reset();
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index_order[type].reset();