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bug #1172 - crash on force index() and SEL_ARG::MAYBE_KEY

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This commit is contained in:
serg@serg.mylan
2003-09-03 22:27:04 +02:00
parent 867b4cc18f
commit be96cc0984
3 changed files with 26 additions and 2 deletions
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13
mysql-test/r/range.result
View File

@ -260,3 +260,16 @@ explain select count(*) from t1 where x in (1,2);
table type possible_keys key key_len ref rows Extra
t1 range x x 5 NULL 2 Using where; Using index
drop table t1;
CREATE TABLE t1 (key1 int(11) NOT NULL default '0', KEY i1 (key1), KEY i2 (key1));
INSERT INTO t1 VALUES (0),(0),(1),(1);
CREATE TABLE t2 (keya int(11) NOT NULL default '0', KEY j1 (keya));
INSERT INTO t2 VALUES (0),(0),(1),(1),(2),(2);
explain select * from t1, t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
table type possible_keys key key_len ref rows Extra
t2 ref j1 j1 4 const 1 Using where; Using index
t1 ALL i1,i2 NULL NULL NULL 4 Range checked for each record (index map: 3)
explain select * from t1 force index(i2), t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
table type possible_keys key key_len ref rows Extra
t2 ref j1 j1 4 const 1 Using where; Using index
t1 ALL i2 NULL NULL NULL 4 Range checked for each record (index map: 2)
DROP TABLE t1,t2;

11
mysql-test/t/range.test
View File

@ -203,3 +203,14 @@ explain select count(*) from t1 where x in (1);
explain select count(*) from t1 where x in (1,2);
drop table t1;
#
# bug #1172
#
CREATE TABLE t1 (key1 int(11) NOT NULL default '0', KEY i1 (key1), KEY i2 (key1));
INSERT INTO t1 VALUES (0),(0),(1),(1);
CREATE TABLE t2 (keya int(11) NOT NULL default '0', KEY j1 (keya));
INSERT INTO t2 VALUES (0),(0),(1),(1),(2),(2);
explain select * from t1, t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
explain select * from t1 force index(i2), t2 where (t1.key1 <t2.keya + 1) and t2.keya=3;
DROP TABLE t1,t2;

4
sql/opt_range.cc
View File

@ -692,7 +692,7 @@ int SQL_SELECT::test_quick_select(key_map keys_to_use, table_map prev_tables,
uint keynr= param.real_keynr[idx];
if ((*key)->type == SEL_ARG::MAYBE_KEY ||
(*key)->maybe_flag)
needed_reg|= (key_map) 1 << keynr;
needed_reg|= (key_map) 1 << keynr;
found_records=check_quick_select(&param, idx, *key);
if (found_records != HA_POS_ERROR && found_records > 2 &&
@ -716,7 +716,7 @@ int SQL_SELECT::test_quick_select(key_map keys_to_use, table_map prev_tables,
param.range_count,
found_records)+
(double) found_records / TIME_FOR_COMPARE);
if (read_time > found_read_time)
if (read_time > found_read_time && found_records != HA_POS_ERROR)
{
read_time=found_read_time;
records=found_records;