Created
February 17, 2016 15:52
-
-
Save SpringMT/03a9f09fb154cf24442a to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
explain select * from range_test where '2000-01-01 00:00:00' <= datetime_col and datetime_col <= '2070-01-01 00:00:00' | { | |
"steps": [ | |
{ | |
"join_preparation": { | |
"select#": 1, | |
"steps": [ | |
{ | |
"expanded_query": "/* select#1 */ select `range_test`.`id` AS `id`,`range_test`.`int_col` AS `int_col`,`range_test`.`bigint_col` AS `bigint_col`,`range_test`.`datetime_col` AS `datetime_col` from `range_test` where (('2000-01-01 00:00:00' <= `range_test`.`datetime_col`) and (`range_test`.`datetime_col` <= '2070-01-01 00:00:00'))" | |
} | |
] | |
} | |
}, | |
{ | |
"join_optimization": { | |
"select#": 1, | |
"steps": [ | |
{ | |
"condition_processing": { | |
"condition": "WHERE", | |
"original_condition": "(('2000-01-01 00:00:00' <= `range_test`.`datetime_col`) and (`range_test`.`datetime_col` <= '2070-01-01 00:00:00'))", | |
"steps": [ | |
{ | |
"transformation": "equality_propagation", | |
"resulting_condition": "(('2000-01-01 00:00:00' <= `range_test`.`datetime_col`) and (`range_test`.`datetime_col` <= '2070-01-01 00:00:00'))" | |
}, | |
{ | |
"transformation": "constant_propagation", | |
"resulting_condition": "(('2000-01-01 00:00:00' <= `range_test`.`datetime_col`) and (`range_test`.`datetime_col` <= '2070-01-01 00:00:00'))" | |
}, | |
{ | |
"transformation": "trivial_condition_removal", | |
"resulting_condition": "(('2000-01-01 00:00:00' <= `range_test`.`datetime_col`) and (`range_test`.`datetime_col` <= '2070-01-01 00:00:00'))" | |
} | |
] | |
} | |
}, | |
{ | |
"table_dependencies": [ | |
{ | |
"table": "`range_test`", | |
"row_may_be_null": false, | |
"map_bit": 0, | |
"depends_on_map_bits": [ | |
] | |
} | |
] | |
}, | |
{ | |
"ref_optimizer_key_uses": [ | |
] | |
}, | |
{ | |
"rows_estimation": [ | |
{ | |
"table": "`range_test`", | |
"range_analysis": { | |
"table_scan": { | |
"rows": 499060, | |
"cost": 101258 | |
}, | |
"potential_range_indices": [ | |
{ | |
"index": "PRIMARY", | |
"usable": false, | |
"cause": "not_applicable" | |
}, | |
{ | |
"index": "idx_int", | |
"usable": false, | |
"cause": "not_applicable" | |
}, | |
{ | |
"index": "idx_bigint", | |
"usable": false, | |
"cause": "not_applicable" | |
}, | |
{ | |
"index": "idx_datetime", | |
"usable": true, | |
"key_parts": [ | |
"datetime_col", | |
"id" | |
] | |
} | |
], | |
"setup_range_conditions": [ | |
], | |
"group_index_range": { | |
"chosen": false, | |
"cause": "not_group_by_or_distinct" | |
}, | |
"analyzing_range_alternatives": { | |
"range_scan_alternatives": [ | |
{ | |
"index": "idx_datetime", | |
"ranges": [ | |
"2000-01-01 00:00:00 <= datetime_col <= 2070-01-01 00:00:00" | |
], | |
"index_dives_for_eq_ranges": true, | |
"rowid_ordered": false, | |
"using_mrr": false, | |
"index_only": false, | |
"rows": 83892, | |
"cost": 100671, | |
"chosen": true | |
} | |
], | |
"analyzing_roworder_intersect": { | |
"usable": false, | |
"cause": "too_few_roworder_scans" | |
} | |
}, | |
"chosen_range_access_summary": { | |
"range_access_plan": { | |
"type": "range_scan", | |
"index": "idx_datetime", | |
"rows": 83892, | |
"ranges": [ | |
"2000-01-01 00:00:00 <= datetime_col <= 2070-01-01 00:00:00" | |
] | |
}, | |
"rows_for_plan": 83892, | |
"cost_for_plan": 100671, | |
"chosen": true | |
} | |
} | |
} | |
] | |
}, | |
{ | |
"considered_execution_plans": [ | |
{ | |
"plan_prefix": [ | |
], | |
"table": "`range_test`", | |
"best_access_path": { | |
"considered_access_paths": [ | |
{ | |
"access_type": "range", | |
"rows": 83892, | |
"cost": 117450, | |
"chosen": true | |
} | |
] | |
}, | |
"cost_for_plan": 117450, | |
"rows_for_plan": 83892, | |
"chosen": true | |
} | |
] | |
}, | |
{ | |
"attaching_conditions_to_tables": { | |
"original_condition": "(('2000-01-01 00:00:00' <= `range_test`.`datetime_col`) and (`range_test`.`datetime_col` <= '2070-01-01 00:00:00'))", | |
"attached_conditions_computation": [ | |
], | |
"attached_conditions_summary": [ | |
{ | |
"table": "`range_test`", | |
"attached": "(('2000-01-01 00:00:00' <= `range_test`.`datetime_col`) and (`range_test`.`datetime_col` <= '2070-01-01 00:00:00'))" | |
} | |
] | |
} | |
}, | |
{ | |
"refine_plan": [ | |
{ | |
"table": "`range_test`", | |
"pushed_index_condition": "(('2000-01-01 00:00:00' <= `range_test`.`datetime_col`) and (`range_test`.`datetime_col` <= '2070-01-01 00:00:00'))", | |
"table_condition_attached": null, | |
"access_type": "range" | |
} | |
] | |
} | |
] | |
} | |
}, | |
{ | |
"join_explain": { | |
"select#": 1, | |
"steps": [ | |
] | |
} | |
} | |
] | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment