Details
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Bug
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Status: Closed (View Workflow)
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Major
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Resolution: Cannot Reproduce
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10.5, 10.6, 10.7
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None
Description
--source include/have_innodb.inc
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CREATE TABLE t1 (f char(8), KEY (f(4))) ENGINE=InnoDB COLLATE=utf8mb3_nopad_bin; |
INSERT INTO t1 VALUES ('y'),('x'),('x'),('x'),('w'),('w'),('v'),('u'),('t'),('t'); |
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EXPLAIN FORMAT=JSON
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SELECT * FROM t1 WHERE f >= 'w'; |
SELECT * FROM t1 WHERE f >= 'w'; |
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# Cleanup
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DROP TABLE t1; |
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Actual result on 10.5 4c3ad244 |
SELECT * FROM t1 WHERE f >= 'w'; |
f
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x
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x
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x
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y
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This is wrong, 'w' values should also be there.
The following query will also fail with an empty result:
SELECT * FROM t1 WHERE f = 'w';
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Changing the engine to MyISAM will return the correct result.
The failure appeared in 10.5 branch after this commit in 10.5.3:
commit eb483c5181ab430877c135c16224284cfc517b3d
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Author: Monty
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Date: Fri Feb 28 12:59:30 2020 +0200
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Updated optimizer costs in multi_range_read_info_const() and sql_select.cc
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Plan on the current branch (wrong result) |
{
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"query_block": {
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"select_id": 1,
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"table": {
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"table_name": "t1",
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"access_type": "range",
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"possible_keys": ["f"],
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"key": "f",
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"key_length": "13",
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"used_key_parts": ["f"],
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"rows": 4,
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"filtered": 100,
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"attached_condition": "t1.f >= 'w'"
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}
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}
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}
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Plan before the change (correct result) |
{
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"query_block": {
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"select_id": 1,
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"table": {
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"table_name": "t1",
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"access_type": "ALL",
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"possible_keys": ["f"],
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"rows": 10,
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"filtered": 40,
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"attached_condition": "t1.f >= 'w'"
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}
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}
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}
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