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Add a index hint to the tagged list of hints. The type and clause of the
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hint will be the current ones (set by set_index_hint())
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/* make a list to hold index hints */
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void alloc_index_hints (Session *session);
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/* read and clear the index hints */
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List<Index_hint> *hints= index_hints;
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/* current index hint kind. used in filling up index_hints */