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subquery execution rather than EXPLAIN line production. In order
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to reset them back, we re-do all of the actions (yes it is ugly):
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join->init(session, item_list, fake_select_lex->options, result);
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join->reset(session, item_list, fake_select_lex->options, result);
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saved_error= mysql_select(session, &fake_select_lex->ref_pointer_array,