File: order_by_optimizer.test

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file content (34 lines) | stat: -rw-r--r-- 1,108 bytes parent folder | download | duplicates (6) 
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--disable_warnings
drop table if exists t0,t1,t2,t3;

--enable_warnings
--echo # 
--echo # MDEV-7885: EXPLAIN shows wrong info for ORDER BY query
--echo # 
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1(a int);
insert into t1 select A.a + B.a* 10 + C.a * 100 from t0 A, t0 B, t0 C;
 
create table t2 (key1 int, col1 int, key(key1));  
insert into t2 select a,a from t0;
insert into t2 select 15,15 from t1;
alter table t2 add key2 int, add key(key2);
--echo # This must show "Using filesort":
explain 
select * from t2 ignore index for order by (key1) where col1<0 order by key1 limit 10;

drop table t0, t1, t2;

--echo # 
--echo # MDEV-8857: [Upstream too] EXPLAIN incorrectly shows Distinct for tables using join buffer
--echo # 
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
 
create table t1 (a int, filler char(200), key(a));
insert into t1 select A.a + B.a* 10, 'AAAAAAAAAAAAAAAAAAAA' from t0 A, t0 B where B.a in (0,1);
explain select distinct A.a from t0 A, t1 B where A.a+B.a> 0;

drop table t0, t1;