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Data comes from Sandy Bridge system running sysbench OLTP RO in 1 thread against 1 table.
Call graphs:
- 0.13% mysqld mysqld
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- Item::const_item() const
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+ 17.90% update_const_equal_items(Item*, st_join_table*, bool) [clone .part.240]
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+ 16.59% Arg_comparator::set_cmp_func(Item_result_field*, Item**, Item**, Item_result)
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+ 13.14% build_equal_items_for_cond(THD*, Item*, COND_EQUAL*, bool)
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+ 12.18% setup_conds(THD*, TABLE_LIST*, List<TABLE_LIST>&, Item**)
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+ 11.84% st_select_lex::update_used_tables()
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+ 7.17% Item_func::update_used_tables()
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+ 4.59% Item_func_between::fix_fields(THD*, Item**)
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+ 4.15% add_key_fields(JOIN*, key_field_t**, unsigned int*, Item*, unsigned long long, st_sargable_param**)
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+ 2.86% add_key_equal_fields(JOIN*, key_field_t**, unsigned int, Item_func*, Item*, bool, Item**, unsigned int, unsigned long long, st_sargable_param**)
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+ 2.33% Item_func::fix_fields(THD*, Item**)
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+ 1.89% Arg_comparator::cache_converted_constant(THD*, Item**, Item**, Item_result)
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+ 1.16% build_equal_items(JOIN*, Item*, COND_EQUAL*, List<TABLE_LIST>*, bool, COND_EQUAL**, bool) [clone .constprop.262]
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+ 1.15% JOIN::init_execution()
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+ 0.94% JOIN::optimize_inner()
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+ 0.58% Item_equal::update_used_tables()
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+ 0.57% JOIN::optimize()
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This is virtual method which can't be inlined. Most time spent for function call convention. Check if we can revoke it's virtual status.
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