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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,195 @@ | ||
| { | ||
| "steps": [ | ||
| { | ||
| "join_preparation": { | ||
| "select#": 1, | ||
| "steps": [ | ||
| { | ||
| "expanded_query": "/* select#1 */ select `employees`.`emp_no` AS `emp_no`,`employees`.`birth_date` AS `birth_date`,`employees`.`first_name` AS `first_name`,`employees`.`last_name` AS `last_name`,`employees`.`gender` AS `gender`,`employees`.`hire_date` AS `hire_date` from `employees` where ((`employees`.`emp_no` < 10010) and (`employees`.`first_name` like 'a%'))" | ||
| } | ||
| ] | ||
| } | ||
| }, | ||
| { | ||
| "join_optimization": { | ||
| "select#": 1, | ||
| "steps": [ | ||
| { | ||
| "condition_processing": { | ||
| "condition": "WHERE", | ||
| "original_condition": "((`employees`.`emp_no` < 10010) and (`employees`.`first_name` like 'a%'))", | ||
| "steps": [ | ||
| { | ||
| "transformation": "equality_propagation", | ||
| "resulting_condition": "((`employees`.`emp_no` < 10010) and (`employees`.`first_name` like 'a%'))" | ||
| }, | ||
| { | ||
| "transformation": "constant_propagation", | ||
| "resulting_condition": "((`employees`.`emp_no` < 10010) and (`employees`.`first_name` like 'a%'))" | ||
| }, | ||
| { | ||
| "transformation": "trivial_condition_removal", | ||
| "resulting_condition": "((`employees`.`emp_no` < 10010) and (`employees`.`first_name` like 'a%'))" | ||
| } | ||
| ] | ||
| } | ||
| }, | ||
| { | ||
| "substitute_generated_columns": { | ||
| } | ||
| }, | ||
| { | ||
| "table_dependencies": [ | ||
| { | ||
| "table": "`employees`", | ||
| "row_may_be_null": false, | ||
| "map_bit": 0, | ||
| "depends_on_map_bits": [ | ||
| ] | ||
| } | ||
| ] | ||
| }, | ||
| { | ||
| "ref_optimizer_key_uses": [ | ||
| ] | ||
| }, | ||
| { | ||
| "rows_estimation": [ | ||
| { | ||
| "table": "`employees`", | ||
| "range_analysis": { | ||
| "table_scan": { | ||
| "rows": 299556, | ||
| "cost": 30878.8 | ||
| }, | ||
| "potential_range_indexes": [ | ||
| { | ||
| "index": "PRIMARY", | ||
| "usable": true, | ||
| "key_parts": [ | ||
| "emp_no" | ||
| ] | ||
| } | ||
| ], | ||
| "setup_range_conditions": [ | ||
| ], | ||
| "group_index_range": { | ||
| "chosen": false, | ||
| "cause": "not_group_by_or_distinct" | ||
| }, | ||
| "skip_scan_range": { | ||
| "potential_skip_scan_indexes": [ | ||
| { | ||
| "index": "PRIMARY", | ||
| "usable": false, | ||
| "cause": "query_references_nonkey_column" | ||
| } | ||
| ] | ||
| }, | ||
| "analyzing_range_alternatives": { | ||
| "range_scan_alternatives": [ | ||
| { | ||
| "index": "PRIMARY", | ||
| "ranges": [ | ||
| "emp_no < 10010" | ||
| ], | ||
| "index_dives_for_eq_ranges": true, | ||
| "rowid_ordered": true, | ||
| "using_mrr": false, | ||
| "index_only": false, | ||
| "in_memory": 0.0112867, | ||
| "rows": 9, | ||
| "cost": 1.91039, | ||
| "chosen": true | ||
| } | ||
| ], | ||
| "analyzing_roworder_intersect": { | ||
| "usable": false, | ||
| "cause": "too_few_roworder_scans" | ||
| } | ||
| }, | ||
| "chosen_range_access_summary": { | ||
| "range_access_plan": { | ||
| "type": "range_scan", | ||
| "index": "PRIMARY", | ||
| "rows": 9, | ||
| "ranges": [ | ||
| "emp_no < 10010" | ||
| ] | ||
| }, | ||
| "rows_for_plan": 9, | ||
| "cost_for_plan": 1.91039, | ||
| "chosen": true | ||
| } | ||
| } | ||
| } | ||
| ] | ||
| }, | ||
| { | ||
| "considered_execution_plans": [ | ||
| { | ||
| "plan_prefix": [ | ||
| ], | ||
| "table": "`employees`", | ||
| "best_access_path": { | ||
| "considered_access_paths": [ | ||
| { | ||
| "rows_to_scan": 9, | ||
| "access_type": "range", | ||
| "range_details": { | ||
| "used_index": "PRIMARY" | ||
| }, | ||
| "resulting_rows": 9, | ||
| "cost": 2.81039, | ||
| "chosen": true | ||
| } | ||
| ] | ||
| }, | ||
| "condition_filtering_pct": 100, | ||
| "rows_for_plan": 9, | ||
| "cost_for_plan": 2.81039, | ||
| "chosen": true | ||
| } | ||
| ] | ||
| }, | ||
| { | ||
| "attaching_conditions_to_tables": { | ||
| "original_condition": "((`employees`.`emp_no` < 10010) and (`employees`.`first_name` like 'a%'))", | ||
| "attached_conditions_computation": [ | ||
| ], | ||
| "attached_conditions_summary": [ | ||
| { | ||
| "table": "`employees`", | ||
| "attached": "((`employees`.`emp_no` < 10010) and (`employees`.`first_name` like 'a%'))" | ||
| } | ||
| ] | ||
| } | ||
| }, | ||
| { | ||
| "finalizing_table_conditions": [ | ||
| { | ||
| "table": "`employees`", | ||
| "original_table_condition": "((`employees`.`emp_no` < 10010) and (`employees`.`first_name` like 'a%'))", | ||
| "final_table_condition ": "((`employees`.`emp_no` < 10010) and (`employees`.`first_name` like 'a%'))" | ||
| } | ||
| ] | ||
| }, | ||
| { | ||
| "refine_plan": [ | ||
| { | ||
| "table": "`employees`" | ||
| } | ||
| ] | ||
| } | ||
| ] | ||
| } | ||
| }, | ||
| { | ||
| "join_execution": { | ||
| "select#": 1, | ||
| "steps": [ | ||
| ] | ||
| } | ||
| } | ||
| ] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| -- 插入规则 | ||
| INSERT INTO query_rewrite.rewrite_rules | ||
| (pattern_database, pattern, replacement) | ||
| VALUES ( | ||
| "employees", | ||
| "SELECT * FROM employees WHERE emp_no > ? ", | ||
| "SELECT * FROM employees WHERE emp_no > ? LIMIT 1" | ||
| ); | ||
| -- 应用规则 | ||
| CALL query_rewrite.flush_rewrite_rules(); |