mariadb/mysql-test/t/opt_tvc.test

create table t1 (a int, b int);

insert into t1
values (1,2), (4,6), (9,7),
       (1,1), (2,5), (7,8);

create table t2 (a int, b int, c int);

insert into t2
values (1,2,3), (5,1,2), (4,3,7),
       (8,9,0), (10,7,1), (5,5,1);

--echo # optimization is not used

let $query= select * from t1 where a in (1,2);
eval $query;
eval explain $query;
eval explain format=json $query;

--echo # set minimum number of values in VALUEs list when optimization works to 2

set @@in_subquery_conversion_threshold= 2;

--echo # single IN-predicate in WHERE-part

let $query= select * from t1 where a in (1,2);

let $optimized_query=
select * from t1
where a in
      (
        select *
        from (values (1),(2)) as tvc_0
      );

eval $query;
eval $optimized_query;
eval explain extended $query;
eval explain extended $optimized_query;

--echo # AND-condition with IN-predicates in WHERE-part

let $query=
select * from t1
where a in (1,2) and
      b in (1,5);

let $optimized_query=
select * from t1
where a in
(
  select *
  from (values (1),(2)) as tvc_0
)
and b in
(
  select *
  from (values (1),(5)) as tvc_1
);

eval $query;
eval $optimized_query;
eval explain extended $query;
eval explain extended $optimized_query;

--echo # subquery with IN-predicate

let $query=
select * from t1
where a in
(
  select a
  from t2 where b in (3,4)
);

let $optimized_query=
select * from t1
where a in
(
  select a from t2
  where b in
  (
    select *
    from (values (3),(4)) as tvc_0
  )
);

eval $query;
eval $optimized_query;
eval explain extended $query;
eval explain extended $optimized_query;

--echo # derived table with IN-predicate

let $query=
select * from
(
  select *
  from t1
  where a in (1,2)
) as dr_table;

let $optimized_query=
select * from
(
  select *
  from t1
  where a in
  (
    select *
    from (values (1),(2))
    as tvc_0
  )
) as dr_table;

eval $query;
eval $optimized_query;
eval explain extended $query;
eval explain extended $optimized_query;

--echo # non-recursive CTE with IN-predicate

let $cte_query=
with tvc_0 as
(
  select *
  from t1
  where a in (1,2)
)
select * from tvc_0;

eval $cte_query;
eval $optimized_query;
eval explain extended $cte_query;
eval explain extended $optimized_query;

--echo # VIEW with IN-predicate

create view v1 as
  select *
  from t1
  where a in (1,2);

create view v2 as
  select *
  from t1
  where a in
  (
    select *
    from (values (1),(2))
    as tvc_0
  )
;

let $query= select * from v1;
let $optimized_query= select * from v2;

eval $query;
eval $optimized_query;
eval explain extended $query;
eval explain extended $optimized_query;

drop view v1,v2;

--echo # subselect defined by derived table with IN-predicate

let $query=
select * from t1
where a in
(
  select 1
  from
  (
    select *
    from t1
    where a in (1,2)
  )
  as dr_table
);

let $optimized_query=
select * from t1
where a in
(
  select 1
  from
  (
    select *
    from t1
    where a in
    (
      select *
      from (values (1),(2))
      as tvc_0
    )
  )
  as dr_table
);

eval $query;
eval $optimized_query;
eval explain extended $query;
eval explain extended $optimized_query;

--echo # derived table with IN-predicate and group by

let $query=
select * from
(
  select max(a),b
  from t1
  where b in (3,5)
  group by b
) as dr_table;

let $optimized_query=
select * from
(
  select max(a),b
  from t1
  where b in
  (
    select *
    from (values (3),(5))
    as tvc_0
  )
  group by b
) as dr_table;

eval $query;
eval $optimized_query;
eval explain extended $query;
eval explain extended $optimized_query;

drop table t1, t2;
set @@in_subquery_conversion_threshold= default;