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MDEV-32475 Add logging of test_if_skip_sort_order to optimizer trace

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This commit is contained in:
Oleg Smirnov
2023-10-18 16:27:56 +07:00
parent 680f732fb8
commit 68542caea1
2 changed files with 165 additions and 134 deletions
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293
mysql-test/main/opt_trace.result
View File

@ -468,6 +468,9 @@ select * from v2 {
} }
] ]
} }
},
{
"test_if_skip_sort_order": []
} }
] ]
} }
@ -796,6 +799,9 @@ explain select * from v1 {
} }
] ]
} }
},
{
"test_if_skip_sort_order": []
} }
] ]
} }
@ -1290,6 +1296,9 @@ EXPLAIN SELECT DISTINCT a FROM t1 {
} }
] ]
} }
},
{
"test_if_skip_sort_order": []
} }
] ]
} }
@ -1485,23 +1494,27 @@ EXPLAIN SELECT MIN(d) FROM t1 where b=2 and c=3 group by a {
} }
}, },
{ {
"reconsidering_access_paths_for_index_ordering": { "test_if_skip_sort_order": [
"clause": "GROUP BY", {
"fanout": 1, "reconsidering_access_paths_for_index_ordering": {
"read_time": 3.3131, "clause": "GROUP BY",
"table": "t1", "fanout": 1,
"rows_estimation": 7, "read_time": 3.3131,
"possible_keys": [ "table": "t1",
{ "rows_estimation": 7,
"index": "a", "possible_keys": [
"can_resolve_order": true, {
"updated_limit": 7, "index": "a",
"index_scan_time": 7, "can_resolve_order": true,
"records": 7, "updated_limit": 7,
"chosen": true "index_scan_time": 7,
"records": 7,
"chosen": true
}
]
} }
] }
} ]
} }
] ]
} }
@ -1687,23 +1700,27 @@ EXPLAIN SELECT id,MIN(a),MAX(a) FROM t1 WHERE a>=20010104e0 GROUP BY id {
} }
}, },
{ {
"reconsidering_access_paths_for_index_ordering": { "test_if_skip_sort_order": [
"clause": "GROUP BY", {
"fanout": 1, "reconsidering_access_paths_for_index_ordering": {
"read_time": 2.0322, "clause": "GROUP BY",
"table": "t1", "fanout": 1,
"rows_estimation": 9, "read_time": 2.0322,
"possible_keys": [ "table": "t1",
{ "rows_estimation": 9,
"index": "id", "possible_keys": [
"can_resolve_order": true, {
"updated_limit": 16, "index": "id",
"index_scan_time": 16, "can_resolve_order": true,
"records": 16, "updated_limit": 16,
"chosen": true "index_scan_time": 16,
"records": 16,
"chosen": true
}
]
} }
] }
} ]
} }
] ]
} }
@ -1878,23 +1895,27 @@ EXPLAIN SELECT * FROM t1 WHERE a = 20010104e0 GROUP BY id {
} }
}, },
{ {
"reconsidering_access_paths_for_index_ordering": { "test_if_skip_sort_order": [
"clause": "GROUP BY", {
"fanout": 1, "reconsidering_access_paths_for_index_ordering": {
"read_time": 2.0322, "clause": "GROUP BY",
"table": "t1", "fanout": 1,
"rows_estimation": 9, "read_time": 2.0322,
"possible_keys": [ "table": "t1",
{ "rows_estimation": 9,
"index": "id", "possible_keys": [
"can_resolve_order": true, {
"updated_limit": 16, "index": "id",
"index_scan_time": 16, "can_resolve_order": true,
"records": 16, "updated_limit": 16,
"chosen": true "index_scan_time": 16,
"records": 16,
"chosen": true
}
]
} }
] }
} ]
} }
] ]
} }
@ -2176,97 +2197,101 @@ explain select * from t1 where a=1 and b=2 order by c limit 1 {
} }
}, },
{ {
"reconsidering_access_paths_for_index_ordering": { "test_if_skip_sort_order": [
"clause": "ORDER BY", {
"fanout": 1, "reconsidering_access_paths_for_index_ordering": {
"read_time": 22.001, "clause": "ORDER BY",
"table": "t1", "fanout": 1,
"rows_estimation": 21, "read_time": 22.001,
"possible_keys": [ "table": "t1",
{ "rows_estimation": 21,
"index": "a_a", "possible_keys": [
"can_resolve_order": true, {
"updated_limit": 47, "index": "a_a",
"index_scan_time": 47, "can_resolve_order": true,
"usable": false, "updated_limit": 47,
"cause": "cost" "index_scan_time": 47,
}, "usable": false,
{ "cause": "cost"
"index": "a_c", },
"can_resolve_order": true, {
"updated_limit": 47, "index": "a_c",
"range_scan_time": 4.324, "can_resolve_order": true,
"index_scan_time": 4.324, "updated_limit": 47,
"records": 180, "range_scan_time": 4.324,
"chosen": true "index_scan_time": 4.324,
}, "records": 180,
{ "chosen": true
"index": "a_b", },
"can_resolve_order": false, {
"cause": "not usable index for the query" "index": "a_b",
"can_resolve_order": false,
"cause": "not usable index for the query"
}
]
} }
]
}
},
{
"table": "t1",
"range_analysis": {
"table_scan": {
"rows": 1000,
"cost": 2e308
}, },
"potential_range_indexes": [ {
{ "table": "t1",
"index": "a_a", "range_analysis": {
"usable": false, "table_scan": {
"cause": "not applicable" "rows": 1000,
}, "cost": 2e308
{ },
"index": "a_c", "potential_range_indexes": [
"usable": true, {
"key_parts": ["a", "c"] "index": "a_a",
}, "usable": false,
{ "cause": "not applicable"
"index": "a_b", },
"usable": false, {
"cause": "not applicable" "index": "a_c",
} "usable": true,
], "key_parts": ["a", "c"]
"setup_range_conditions": [], },
"group_index_range": { {
"chosen": false, "index": "a_b",
"cause": "no group by or distinct" "usable": false,
}, "cause": "not applicable"
"analyzing_range_alternatives": { }
"range_scan_alternatives": [ ],
{ "setup_range_conditions": [],
"index": "a_c", "group_index_range": {
"ranges": ["(1) <= (a) <= (1)"], "chosen": false,
"rowid_ordered": false, "cause": "no group by or distinct"
"using_mrr": false, },
"index_only": false, "analyzing_range_alternatives": {
"rows": 180, "range_scan_alternatives": [
"cost": 229.72, {
"index": "a_c",
"ranges": ["(1) <= (a) <= (1)"],
"rowid_ordered": false,
"using_mrr": false,
"index_only": false,
"rows": 180,
"cost": 229.72,
"chosen": true
}
],
"analyzing_roworder_intersect": {
"cause": "too few roworder scans"
},
"analyzing_index_merge_union": []
},
"chosen_range_access_summary": {
"range_access_plan": {
"type": "range_scan",
"index": "a_c",
"rows": 180,
"ranges": ["(1) <= (a) <= (1)"]
},
"rows_for_plan": 180,
"cost_for_plan": 229.72,
"chosen": true "chosen": true
} }
], }
"analyzing_roworder_intersect": {
"cause": "too few roworder scans"
},
"analyzing_index_merge_union": []
},
"chosen_range_access_summary": {
"range_access_plan": {
"type": "range_scan",
"index": "a_c",
"rows": 180,
"ranges": ["(1) <= (a) <= (1)"]
},
"rows_for_plan": 180,
"cost_for_plan": 229.72,
"chosen": true
} }
} ]
} }
] ]
} }

6
sql/sql_select.cc
View File

@ -23608,8 +23608,12 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
bool orig_cond_saved= false; bool orig_cond_saved= false;
int best_key= -1; int best_key= -1;
bool changed_key= false; bool changed_key= false;
THD *thd= tab->join->thd;
DBUG_ENTER("test_if_skip_sort_order"); DBUG_ENTER("test_if_skip_sort_order");
Json_writer_object trace_wrapper(thd);
Json_writer_array trace_arr(thd, "test_if_skip_sort_order");
/* Check that we are always called with first non-const table */ /* Check that we are always called with first non-const table */
DBUG_ASSERT(tab == tab->join->join_tab + tab->join->const_tables); DBUG_ASSERT(tab == tab->join->join_tab + tab->join->const_tables);
@ -23618,6 +23622,8 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
tab->type == JT_CONST || tab->type == JT_CONST ||
tab->type == JT_SYSTEM) tab->type == JT_SYSTEM)
{ {
Json_writer_object trace_skip(thd);
trace_skip.add("skipped", "single row access method");
DBUG_RETURN(1); DBUG_RETURN(1);
} }