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{ | |
"steps": [ | |
{ | |
"join_preparation": { | |
"select#": 1, | |
"steps": [ | |
{ | |
"expanded_query": "/* select#1 */ select `pi1`.`price` AS `price`,`pi1`.`dateandtime` AS `dateandtime`,`pi1`.`customerid` AS `customerid` from `pi1` FORCE INDEX (`pi1_pdc`) where (`pi1`.`price` >= 852.366314) order by `pi1`.`price`,`pi1`.`dateandtime`,`pi1`.`customerid` limit 10" | |
} | |
] | |
} | |
}, | |
{ | |
"join_optimization": { | |
"select#": 1, | |
"steps": [ | |
{ | |
"condition_processing": { | |
"condition": "WHERE", | |
"original_condition": "(`pi1`.`price` >= 852.366314)", | |
"steps": [ | |
{ | |
"transformation": "equality_propagation", | |
"resulting_condition": "(`pi1`.`price` >= 852.366314)" | |
}, | |
{ | |
"transformation": "constant_propagation", | |
"resulting_condition": "(`pi1`.`price` >= 852.366314)" | |
}, | |
{ | |
"transformation": "trivial_condition_removal", | |
"resulting_condition": "(`pi1`.`price` >= 852.366314)" | |
} | |
] | |
} | |
}, | |
{ | |
"table_dependencies": [ | |
{ | |
"table": "`pi1` FORCE INDEX (`pi1_pdc`)", | |
"row_may_be_null": false, | |
"map_bit": 0, | |
"depends_on_map_bits": [ | |
] | |
} | |
] | |
}, | |
{ | |
"ref_optimizer_key_uses": [ | |
] | |
}, | |
{ | |
"rows_estimation": [ | |
{ | |
"table": "`pi1` FORCE INDEX (`pi1_pdc`)", | |
"range_analysis": { | |
"table_scan": { | |
"rows": 508579538, | |
"cost": 2e308 | |
}, | |
"potential_range_indices": [ | |
{ | |
"index": "PRIMARY", | |
"usable": false, | |
"cause": "not_applicable" | |
}, | |
{ | |
"index": "pi1_marketsegment", | |
"usable": false, | |
"cause": "not_applicable" | |
}, | |
{ | |
"index": "pi1_registersegment", | |
"usable": false, | |
"cause": "not_applicable" | |
}, | |
{ | |
"index": "pi1_pdc", | |
"usable": true, | |
"key_parts": [ | |
"price", | |
"dateandtime", | |
"customerid", | |
"transactionid" | |
] | |
} | |
], | |
"best_covering_index_scan": { | |
"index": "pi1_pdc", | |
"cost": 1.03e8, | |
"chosen": true | |
}, | |
"setup_range_conditions": [ | |
], | |
"group_index_range": { | |
"chosen": false, | |
"cause": "not_group_by_or_distinct" | |
}, | |
"analyzing_range_alternatives": { | |
"range_scan_alternatives": [ | |
{ | |
"index": "pi1_pdc", | |
"ranges": [ | |
"852.366 <= price" | |
], | |
"index_dives_for_eq_ranges": true, | |
"rowid_ordered": false, | |
"using_mrr": false, | |
"index_only": true, | |
"rows": 154200716, | |
"cost": 3.13e7, | |
"chosen": true | |
} | |
], | |
"analyzing_roworder_intersect": { | |
"usable": false, | |
"cause": "too_few_roworder_scans" | |
} | |
}, | |
"chosen_range_access_summary": { | |
"range_access_plan": { | |
"type": "range_scan", | |
"index": "pi1_pdc", | |
"rows": 154200716, | |
"ranges": [ | |
"852.366 <= price" | |
] | |
}, | |
"rows_for_plan": 154200716, | |
"cost_for_plan": 3.13e7, | |
"chosen": true | |
} | |
} | |
} | |
] | |
}, | |
{ | |
"considered_execution_plans": [ | |
{ | |
"plan_prefix": [ | |
], | |
"table": "`pi1` FORCE INDEX (`pi1_pdc`)", | |
"best_access_path": { | |
"considered_access_paths": [ | |
{ | |
"access_type": "range", | |
"rows": 1.54e8, | |
"cost": 6.21e7, | |
"chosen": true | |
} | |
] | |
}, | |
"cost_for_plan": 6.21e7, | |
"rows_for_plan": 1.54e8, | |
"chosen": true | |
} | |
] | |
}, | |
{ | |
"attaching_conditions_to_tables": { | |
"original_condition": "(`pi1`.`price` >= 852.366314)", | |
"attached_conditions_computation": [ | |
{ | |
"table": "`pi1` FORCE INDEX (`pi1_pdc`)", | |
"rechecking_index_usage": { | |
"recheck_reason": "low_limit", | |
"limit": 10, | |
"row_estimate": 1.54e8 | |
} | |
} | |
], | |
"attached_conditions_summary": [ | |
{ | |
"table": "`pi1` FORCE INDEX (`pi1_pdc`)", | |
"attached": "(`pi1`.`price` >= 852.366314)" | |
} | |
] | |
} | |
}, | |
{ | |
"clause_processing": { | |
"clause": "ORDER BY", | |
"original_clause": "`pi1`.`price`,`pi1`.`dateandtime`,`pi1`.`customerid`", | |
"items": [ | |
{ | |
"item": "`pi1`.`price`" | |
}, | |
{ | |
"item": "`pi1`.`dateandtime`" | |
}, | |
{ | |
"item": "`pi1`.`customerid`" | |
} | |
], | |
"resulting_clause_is_simple": true, | |
"resulting_clause": "`pi1`.`price`,`pi1`.`dateandtime`,`pi1`.`customerid`" | |
} | |
}, | |
{ | |
"refine_plan": [ | |
{ | |
"table": "`pi1` FORCE INDEX (`pi1_pdc`)", | |
"access_type": "range" | |
} | |
] | |
}, | |
{ | |
"reconsidering_access_paths_for_index_ordering": { | |
"clause": "ORDER BY", | |
"index_order_summary": { | |
"table": "`pi1` FORCE INDEX (`pi1_pdc`)", | |
"index_provides_order": true, | |
"order_direction": "asc", | |
"index": "pi1_pdc", | |
"plan_changed": false | |
} | |
} | |
} | |
] | |
} | |
}, | |
{ | |
"join_execution": { | |
"select#": 1, | |
"steps": [ | |
] | |
} | |
} | |
] |
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