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Fixed typo on opt_range.cc: SEL_ARG::number_of_eq_groups()

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It could cause wrong range estimation for GROUP BY queries that are
using 'WHERE index_part >= constant'.
(The function was trying to check for 'index_part = constant')

Reporter: Yuty Chaikou
This commit is contained in:
Monty
2023-06-18 12:11:18 +03:00
parent 5fb2c031f7
commit f25a74c0b0
2 changed files with 4 additions and 4 deletions
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6
mysql-test/main/explain_json.result
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@ -1375,7 +1375,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx_t1_1 163 NULL 128 Using where; Using index
explain select count(distinct a1,a2,b) from t1 where a1 >= "" and (a2 >= 'b') and (b = 'a');
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_1 147 NULL 1 Using where; Using index for group-by
1 SIMPLE t1 range idx_t1_0,idx_t1_1,idx_t1_2 idx_t1_2 147 NULL 17 Using where; Using index for group-by
explain format=json select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a');
EXPLAIN
{
@ -1438,11 +1438,11 @@ EXPLAIN
"table_name": "t1",
"access_type": "range",
"possible_keys": ["idx_t1_0", "idx_t1_1", "idx_t1_2"],
"key": "idx_t1_1",
"key": "idx_t1_2",
"key_length": "147",
"used_key_parts": ["a1", "a2", "b"],
"loops": 1,
"rows": 1,
"rows": 17,
"cost": "COST_REPLACED",
"filtered": 100,
"attached_condition": "t1.b = 'a' and t1.a1 >= '' and t1.a2 >= 'b'",