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284593413f
The code in best_access_path() uses PREV_BITS(uint, N) to
compute a bitmap of all keyparts: {keypart0, ... keypart{N-1}).
The problem is that PREV_BITS($type, N) macro code can't handle the case
when N=<number of bits in $type).
Also, why use PREV_BITS(uint, ...) for key part map computations when
we could have used PREV_BITS(key_part_map) ?
Fixed both:
- Change PREV_BITS(type, N) to handle any N in [0; n_bits(type)].
- Change PREV_BITS() to use key_part_map when computing key_part_map bitmaps.
59 lines
2.1 KiB
Text
59 lines
2.1 KiB
Text
drop table if exists t0,t1,t2,t3;
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#
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# BUG#38049 incorrect rows estimations with references from preceding table
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#
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create table t0 (a int);
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insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a varchar(32));
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insert into t1 values ('owner'),('requester'),('admincc'),('cc');
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CREATE TABLE t2 (
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id int(11) NOT NULL,
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type varchar(32) default NULL,
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PRIMARY KEY (id)
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);
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insert into t2 values (1,'owner'), (2,'admincc');
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CREATE TABLE t3 (
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id int(11) NOT NULL,
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domain varchar(32) default NULL,
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type varchar(32) default NULL,
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PRIMARY KEY (id)
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);
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set @domain='system';
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set @pk=0;
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INSERT INTO t3 select @pk:=@pk+1, 'system', t1.a from t1;
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INSERT INTO t3 select @pk:=@pk+1, 'queue', t1.a from t1, t0 where t0.a<3;
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INSERT INTO t3 select @pk:=@pk+1, 'ticket', t1.a from t1, t0 A, t0 B, t0 C;
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CREATE INDEX groups_d ON t3(domain);
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CREATE INDEX groups_t ON t3(type);
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CREATE INDEX groups_td ON t3(type, domain);
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CREATE INDEX groups_dt ON t3(domain, type);
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For table g this must use ref(groups_dt) and #rows should be around 15 and not 335:
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explain
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SELECT STRAIGHT_JOIN g.id FROM t2 a, t3 g USE INDEX(groups_dt)
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WHERE g.domain = 'queue' AND g.type = a.type;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE a ALL NULL NULL NULL NULL 2 Using where
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1 SIMPLE g ref groups_dt groups_dt 70 const,test.a.type 13 Using index condition
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drop table t0,t1,t2,t3;
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#
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# MDEV-35253: xa_prepare_unlock_unmodified fails: shift exponent 32 is too large
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#
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set @create=
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concat("create table t1(",
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(select group_concat(concat("col",seq, " int")) from seq_1_to_32),
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",\n index idx1(",
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(select group_concat(concat("col",seq)) from seq_1_to_32),
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")\n)"
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);
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$create_tbl;
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insert into t1() values (),(),();
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analyze table t1;
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Table Op Msg_type Msg_text
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test.t1 analyze status Engine-independent statistics collected
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test.t1 analyze status OK
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# Must not produce a "shift exponent 32 is too large" runtime ubsan error
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explain select * from t1 where col1=1;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref idx1 idx1 5 const 1 Using index
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drop table t1;
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End of 10.5 tests
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