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66ff1632f5
(Based on original patch by Sanja Byelkin) Make the code that produces JSON output handle LooseScan quick select. The output we produce is compatible with MySQL 5.6.
281 lines
10 KiB
Text
281 lines
10 KiB
Text
#
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# EXPLAIN FORMAT=JSON tests. These are tests developed for MariaDB.
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#
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--disable_warnings
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drop table if exists t0,t1,t2;
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--enable_warnings
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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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explain format=json select * from t0;
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explain format=json select * from t0 where 1>2;
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explain format=json select * from t0 where a<3;
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--echo # Try a basic join
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create table t1 (a int, b int, filler char(32), key(a));
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insert into t1
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select
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a.a + b.a* 10 + c.a * 100,
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a.a + b.a* 10 + c.a * 100,
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'filler'
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from t0 a, t0 b, t0 c;
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explain format=json select * from t0,t1 where t1.a=t0.a;
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--echo # Try range and index_merge
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create table t2 (a1 int, a2 int, b1 int, b2 int, key(a1,a2), key(b1,b2));
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insert into t2 select a,a,a,a from t1;
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explain format=json select * from t2 where a1<5;
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explain format=json select * from t2 where a1=1 or b1=2;
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explain format=json select * from t2 where a1=1 or (b1=2 and b2=3);
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explain format=json select * from t2 where (a1=1 and a2=1) or
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(b1=2 and b2=1);
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--echo # Try ref access on two key components
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explain format=json select * from t0,t2 where t2.b1=t0.a and t2.b2=4;
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drop table t1,t2;
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--echo #
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--echo # Try a UNION
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--echo #
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explain format=json select * from t0 A union select * from t0 B;
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explain format=json select * from t0 A union all select * from t0 B;
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--echo #
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--echo # Subqueries
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--echo #
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create table t1 (a int, b int);
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insert into t1 select a,a from t0;
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explain format=json select a, a > (select max(b) from t1 where t1.b=t0.a) from t0;
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explain format=json
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select * from t0 where
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a > (select max(b) from t1 where t1.b=t0.a) or a < 3 ;
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drop table t1;
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--echo #
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--echo # Join buffering
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--echo #
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create table t1 (a int, b int);
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insert into t1 select tbl1.a+10*tbl2.a, tbl1.a+10*tbl2.a from t0 tbl1, t0 tbl2;
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explain format=json
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select * from t1 tbl1, t1 tbl2 where tbl1.a=tbl2.a and tbl1.b < 3 and tbl2.b < 5;
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drop table t1;
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--echo #
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--echo # Single-table UPDATE/DELETE, INSERT
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--echo #
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explain format=json delete from t0;
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explain format=json delete from t0 where 1 > 2;
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explain format=json delete from t0 where a < 3;
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explain format=json update t0 set a=3 where a in (2,3,4);
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explain format=json insert into t0 values (1);
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create table t1 like t0;
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explain format=json insert into t1 values ((select max(a) from t0));
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drop table t1;
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--echo #
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--echo # A derived table
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--echo #
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create table t1 (a int, b int);
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insert into t1 select a,a from t0;
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explain format=json
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select * from (select a, count(*) as cnt from t1 group by a) as tbl
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where cnt>0;
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explain format=json
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select * from (select a, count(*) as cnt from t1 group by a) as tbl1, t1 as
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tbl2 where cnt=tbl2.a;
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--echo #
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--echo # Non-merged semi-join (aka JTBM)
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--echo #
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explain format=json
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select * from t1 where a in (select max(a) from t1 group by b);
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--echo #
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--echo # Semi-join Materialization
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--echo #
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create table t2 like t1;
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insert into t2 select * from t1;
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explain format=json
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select * from t1,t2 where t1.a in ( select a from t0);
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--echo #
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--echo # First-Match
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--echo #
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explain
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select * from t2 where t2.a in ( select a from t1 where t1.b=t2.b);
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explain format=json
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select * from t2 where t2.a in ( select a from t1 where t1.b=t2.b);
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--echo #
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--echo # Duplicate Weedout
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--echo #
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set @tmp= @@optimizer_switch;
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set optimizer_switch='firstmatch=off';
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explain
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select * from t2 where t2.a in ( select a from t1 where t1.b=t2.b);
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explain format=json
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select * from t2 where t2.a in ( select a from t1 where t1.b=t2.b);
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set optimizer_switch=@tmp;
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drop table t1,t2;
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--echo #
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--echo # MRR for range access (no BKA, just MRR)
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--echo #
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create table t1 (a int, b int, key(a));
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insert into t1 select tbl1.a+10*tbl2.a, 12345 from t0 tbl1, t0 tbl2;
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set @tmp= @@optimizer_switch;
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set optimizer_switch='mrr=on,mrr_sort_keys=on';
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explain format=json select * from t1 where a < 3;
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--echo # 'Range checked for each record'
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set optimizer_switch=@tmp;
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explain format=json
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select * from t1 tbl1, t1 tbl2 where tbl2.a < tbl1.b;
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drop table t1;
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drop table t0;
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--echo #
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--echo # MDEV-7265: "Full scan on NULL key", the join case
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--echo #
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CREATE TABLE t1 (a INT, KEY(a));
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INSERT INTO t1 VALUES (1),(2);
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CREATE TABLE t2 (b INT);
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INSERT INTO t2 VALUES (3),(4);
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EXPLAIN FORMAT=JSON SELECT * FROM t1 AS outer_t1 WHERE a <> ALL ( SELECT a FROM t1, t2 WHERE b <> outer_t1.a );
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DROP TABLE t1,t2;
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--echo #
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--echo # Join's constant expression
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--echo #
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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 int, b int);
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insert into t1 select tbl1.a+10*tbl2.a, 1234 from t0 tbl1, t0 tbl2;
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explain format=json
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select * from t0
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where
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20000 > all (select max(tbl1.a + tbl2.a)
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from t1 tbl1, t1 tbl2 where tbl1.b=tbl2.b);
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drop table t1;
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drop table t0;
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--echo #
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--echo # MDEV-7264: Assertion `0' failed in subselect_engine::get_identifier() on EXPLAIN JSON
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--echo #
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CREATE TABLE t1 (a INT);
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INSERT INTO t1 VALUES (1),(2);
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CREATE TABLE t2 (b INT);
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INSERT INTO t2 VALUES (3),(4);
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EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE a <> ALL ( SELECT b FROM t2 );
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DROP TABLE t1, t2;
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--echo #
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--echo # MDEV-7927: Server crashes in in Time_and_counter_tracker::incr_loops
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--echo #
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CREATE TABLE t1 (i INT);
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INSERT INTO t1 VALUES (1),(2);
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EXPLAIN SELECT * FROM t1 WHERE 3 IN ( SELECT 4 UNION SELECT 5 );
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DROP TABLE t1;
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--echo #
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--echo # MDEV-7860: EXPLAIN FORMAT=JSON crashes for loose scan query
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--echo #
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create table t2(a int);
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insert into t2 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
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create table t1 (a int, b int, c int, d int, key(a,b,c));
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insert into t1 select A.a, B.a, C.a, D.a from t2 A, t2 B, t2 C, t2 D;
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explain select count(distinct b) from t1 group by a;
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explain format=json select count(distinct b) from t1 group by a;
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--replace_regex /"r_total_time_ms": [0-9]*[.]?[0-9]*/"r_total_time_ms": "REPLACED"/
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analyze format=json select count(distinct b) from t1 group by a;
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drop table t1,t2;
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--echo #
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--echo # Try both variants of LooseScan (data/queries borrowed from group_min_max.test)
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--echo #
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create table t1 (
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a1 char(64), a2 char(64), b char(16), c char(16) not null, d char(16), dummy char(248) default ' '
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);
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insert into t1 (a1, a2, b, c, d) values
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('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
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('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
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('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
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('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
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('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
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('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
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('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
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('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
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('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
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('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
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('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
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('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
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('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
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('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
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('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
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('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4'),
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('a','a','a','a111','xy1'),('a','a','a','b111','xy2'),('a','a','a','c111','xy3'),('a','a','a','d111','xy4'),
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('a','a','b','e112','xy1'),('a','a','b','f112','xy2'),('a','a','b','g112','xy3'),('a','a','b','h112','xy4'),
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('a','b','a','i121','xy1'),('a','b','a','j121','xy2'),('a','b','a','k121','xy3'),('a','b','a','l121','xy4'),
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('a','b','b','m122','xy1'),('a','b','b','n122','xy2'),('a','b','b','o122','xy3'),('a','b','b','p122','xy4'),
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('b','a','a','a211','xy1'),('b','a','a','b211','xy2'),('b','a','a','c211','xy3'),('b','a','a','d211','xy4'),
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('b','a','b','e212','xy1'),('b','a','b','f212','xy2'),('b','a','b','g212','xy3'),('b','a','b','h212','xy4'),
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('b','b','a','i221','xy1'),('b','b','a','j221','xy2'),('b','b','a','k221','xy3'),('b','b','a','l221','xy4'),
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('b','b','b','m222','xy1'),('b','b','b','n222','xy2'),('b','b','b','o222','xy3'),('b','b','b','p222','xy4'),
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('c','a','a','a311','xy1'),('c','a','a','b311','xy2'),('c','a','a','c311','xy3'),('c','a','a','d311','xy4'),
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('c','a','b','e312','xy1'),('c','a','b','f312','xy2'),('c','a','b','g312','xy3'),('c','a','b','h312','xy4'),
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('c','b','a','i321','xy1'),('c','b','a','j321','xy2'),('c','b','a','k321','xy3'),('c','b','a','l321','xy4'),
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('c','b','b','m322','xy1'),('c','b','b','n322','xy2'),('c','b','b','o322','xy3'),('c','b','b','p322','xy4'),
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('d','a','a','a411','xy1'),('d','a','a','b411','xy2'),('d','a','a','c411','xy3'),('d','a','a','d411','xy4'),
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('d','a','b','e412','xy1'),('d','a','b','f412','xy2'),('d','a','b','g412','xy3'),('d','a','b','h412','xy4'),
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('d','b','a','i421','xy1'),('d','b','a','j421','xy2'),('d','b','a','k421','xy3'),('d','b','a','l421','xy4'),
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('d','b','b','m422','xy1'),('d','b','b','n422','xy2'),('d','b','b','o422','xy3'),('d','b','b','p422','xy4');
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create index idx_t1_0 on t1 (a1);
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create index idx_t1_1 on t1 (a1,a2,b,c);
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create index idx_t1_2 on t1 (a1,a2,b);
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analyze table t1;
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explain select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a');
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explain select count(distinct a1,a2,b,c) from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121');
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explain format=json select count(distinct a1,a2,b) from t1 where (a2 >= 'b') and (b = 'a');
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explain format=json select count(distinct a1,a2,b,c) from t1 where (a2 >= 'b') and (b = 'a') and (c = 'i121');
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drop table t1;
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