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);

create table t3 (a int, b varchar(16), index idx(a));
insert into t3 values
  (1, "abc"), (3, "egh"), (8, "axxx"), (10, "abc"),
  (2, "ccw"), (8, "wqqe"), (7, "au"), (9, "waa"),
  (3, "rass"), (9, "ert"), (9, "lok"), (8, "aww"),
  (1, "todd"), (3, "rew"), (8, "aww"), (3, "sw"),
  (11, "llk"), (7, "rbw"), (1, "sm"), (2, "jyp"),
  (4, "yq"), (5, "pled"), (12, "ligin"), (12, "toww"),
  (6, "mxm"), (15, "wanone"), (9, "sunqq"), (2, "abe");

--echo # optimization is not used

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

--echo # prepare statement

prepare stmt from "select * from t1 where a in (1,2)";
execute stmt;
execute stmt;
deallocate prepare stmt;

--echo # use inside out access from tvc rows

let $query= select * from t3 where a in (1,4,10);
set @@in_subquery_conversion_threshold= default;
eval $query;
eval explain extended $query;
set @@in_subquery_conversion_threshold= 2;
eval $query;
eval explain extended $query;

--echo # use vectors in IN predeicate

set @@in_subquery_conversion_threshold= 4;

let $query=
select * from t1 where (a,b) in ((1,2),(3,4));

eval $query;
eval explain extended $query;
set @@in_subquery_conversion_threshold= 2;

--echo # trasformation works for the one IN predicate and doesn't work for the other

set @@in_subquery_conversion_threshold= 5;

let $query=
select * from t2
where (a,b) in ((1,2),(8,9)) and
      (a,c) in ((1,3),(8,0),(5,1));

eval $query;
eval explain extended $query;
set @@in_subquery_conversion_threshold= 2;

drop table t1, t2, t3;
set @@in_subquery_conversion_threshold= default;