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SET optimizer_trace_max_mem_size=1048576; SET @@session.optimizer_trace="enabled=on"; # # BUG#18195373: OPTIMIZER TRACE SHOULD PRINT NAME OF # INDEX FOR RANGE ACCESS CREATE TABLE t1 (a VARCHAR(200), b TEXT, FULLTEXT (a,b)); INSERT INTO t1 VALUES('Testing how', 'full-text search'), ('is printed to the', 'optimizer trace.'), ('We need test coverage','of that too'); SELECT * FROM t1 WHERE MATCH(a,b) AGAINST ("coverage"); a b We need test coverage of that too SELECT * FROM information_schema.OPTIMIZER_TRACE; QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES SELECT * FROM t1 WHERE MATCH(a,b) AGAINST ("coverage") { "steps": [ { "join_preparation": { "select#": 1, "steps": [ { "expanded_query": "/* select#1 */ select `t1`.`a` AS `a`,`t1`.`b` AS `b` from `t1` where (match `t1`.`a`,`t1`.`b` against ('coverage'))" } ] } }, { "join_optimization": { "select#": 1, "steps": [ { "condition_processing": { "condition": "WHERE", "original_condition": "(match `t1`.`a`,`t1`.`b` against ('coverage'))", "steps": [ { "transformation": "equality_propagation", "resulting_condition": "(match `t1`.`a`,`t1`.`b` against ('coverage'))" }, { "transformation": "constant_propagation", "resulting_condition": "(match `t1`.`a`,`t1`.`b` against ('coverage'))" }, { "transformation": "trivial_condition_removal", "resulting_condition": "(match `t1`.`a`,`t1`.`b` against ('coverage'))" } ] } }, { "substitute_generated_columns": { } }, { "table_dependencies": [ { "table": "`t1`", "row_may_be_null": false, "map_bit": 0, "depends_on_map_bits": [ ] } ] }, { "ref_optimizer_key_uses": [ { "table": "`t1`", "field": "<fulltext>", "equals": "(match `t1`.`a`,`t1`.`b` against ('coverage'))", "null_rejecting": false } ] }, { "rows_estimation": [ { "table": "`t1`", "table_scan": { "rows": 3, "cost": 2 } } ] }, { "considered_execution_plans": [ { "plan_prefix": [ ], "table": "`t1`", "best_access_path": { "considered_access_paths": [ { "access_type": "fulltext", "index": "a", "rows": 1, "cost": 1.2, "chosen": true }, { "access_type": "scan", "cost": 2.6, "rows": 3, "chosen": false, "cause": "cost" } ] }, "condition_filtering_pct": 100, "rows_for_plan": 1, "cost_for_plan": 1.2, "chosen": true } ] }, { "attaching_conditions_to_tables": { "original_condition": "(match `t1`.`a`,`t1`.`b` against ('coverage'))", "attached_conditions_computation": [ ], "attached_conditions_summary": [ { "table": "`t1`", "attached": "(match `t1`.`a`,`t1`.`b` against ('coverage'))" } ] } }, { "refine_plan": [ { "table": "`t1`" } ] } ] } }, { "join_execution": { "select#": 1, "steps": [ ] } } ] } 0 0 DROP TABLE t1;
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