win.test

#
#  Window Functions Tests
#

--disable_warnings
drop table if exists t1,t2;
--enable_warnings

--echo # ########################################################################
--echo # # Parser tests
--echo # ########################################################################
--echo #
--echo #  Check what happens when one attempts to use window function without OVER clause 
create table t1 (a int, b int);
insert into t1 values (1,1),(2,2);

--error ER_PARSE_ERROR
select row_number() from t1;
--error ER_PARSE_ERROR
select rank() from t1;

--echo # Attempt to use window function in the WHERE clause
--error ER_WRONG_PLACEMENT_OF_WINDOW_FUNCTION 
select * from t1 where 1=rank() over (order by a);
--error ER_WRONG_PLACEMENT_OF_WINDOW_FUNCTION
select * from t1 where 1>row_number() over (partition by b order by a);
drop table t1;

--echo # ########################################################################
--echo # # Functionality tests
--echo # ########################################################################
--echo #
--echo #  Check if ROW_NUMBER() works in basic cases
create table t1(a int, b int, x char(32));
insert into t1 values (2, 10, 'xx');
insert into t1 values (2, 10, 'zz');
insert into t1 values (2, 20, 'yy');
insert into t1 values (3, 10, 'xxx');
insert into t1 values (3, 20, 'vvv');

--sorted_result
select a, row_number() over (partition by a order by b) from t1;

select a, b, x, row_number() over (partition by a order by x) from t1;

drop table t1;

create table t1 (pk int primary key, a int, b int);
insert into t1 values 
  (1, 10, 22),
  (2, 11, 21),
  (3, 12, 20),
  (4, 13, 19),
  (5, 14, 18);

select 
  pk, a, b, 
  row_number() over (order by a), 
  row_number() over (order by b)
from t1;

drop table t1;

--echo #
--echo # Try RANK() function
--echo #
create table t2 (
  pk int primary key, 
  a int
);

insert into t2 values
( 1 , 0),
( 2 , 0),
( 3 , 1),
( 4 , 1),
( 8 , 2),
( 5 , 2),
( 6 , 2),
( 7 , 2),
( 9 , 4),
(10 , 4);

select pk, a, rank() over (order by a) from t2;
select pk, a, rank() over (order by a desc) from t2;

drop table t2;

--echo #
--echo # Try DENSE_RANK() function
--echo #
create table t3 (
  pk int primary key,
  a int,
  b int
);

insert into t3 values
( 1 , 0, 10),
( 2 , 0, 10),
( 3 , 1, 10),
( 4 , 1, 10),
( 8 , 2, 10),
( 5 , 2, 20),
( 6 , 2, 20),
( 7 , 2, 20),
( 9 , 4, 20),
(10 , 4, 20);

select pk, a, b, rank() over (order by a), dense_rank() over (order by a) from t3;
select pk, a, b, rank() over (partition by b order by a), dense_rank() over (partition by b order by a) from t3;

drop table t3;

--echo #
--echo # Try Aggregates as window functions. With frames.
--echo #
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

create table t1 (pk int, c int);
insert into t1 select a+1,1 from t0;
update t1 set c=2 where pk not in (1,2,3,4);
select * from t1;

select 
  pk, c, 
  count(*) over (partition by c order by pk 
                 rows between 2 preceding and 2 following) as CNT
from t1;

select 
  pk, c, 
  count(*) over (partition by c order by pk 
                 rows between 1 preceding and 2 following) as CNT
from t1;

select
  pk, c,  
  count(*) over (partition by c order by pk
                 rows between 2 preceding and current row) as CNT 
from t1;

select 
  pk,c, 
  count(*) over (partition by c order by pk rows
                 between 1 following and 2 following) as CNT
from t1;

select 
  pk,c, 
  count(*) over (partition by c order by pk rows
                 between 2 preceding and 1 preceding) as CNT
from t1;

select
  pk, c,  
  count(*) over (partition by c order by pk
                 rows between current row and 1 following) as CNT 
from t1;

--echo # Check ORDER BY DESC
select 
  pk, c, 
  count(*) over (partition by c order by pk desc
                 rows between 2 preceding and 2 following) as CNT
from t1;

drop table t0,t1;

--echo #
--echo # Resolution of window names
--echo #

create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

create table t1 (pk int, c int);
insert into t1 select a+1,1 from t0;
update t1 set c=2 where pk not in (1,2,3,4);
select * from t1;

select 
  pk, c,
  count(*) over w1 as CNT
from t1
window w1 as (partition by c order by pk 
              rows between 2 preceding and 2 following);

select 
  pk, c, 
  count(*) over (w1 rows between 2 preceding and 2 following) as CNT
from t1
window w1 as (partition by c order by pk);

select 
  pk, c, 
  count(*) over (w1 order by pk rows between 2 preceding and 2 following) as CNT
from t1
window w1 as (partition by c);

select 
  pk, c, 
  count(*) over (w2 rows between 2 preceding and 2 following) as CNT
from t1
window w1 as (partition by c), w2 as (w1 order by pk);

select 
  pk, c, 
  count(*) over w3 as CNT
from t1
window
  w1 as (partition by c), 
  w2 as (w1 order by pk),
  w3 as (w2 rows between 2 preceding and 2 following);

--error ER_WRONG_WINDOW_SPEC_NAME
select 
  pk, c, 
  count(*) over w as CNT
from t1
window w1 as (partition by c order by pk 
              rows between 2 preceding and 2 following);

--error ER_DUP_WINDOW_NAME
select 
  pk, c, 
  count(*) over (w2 rows between 2 preceding and 2 following) as CNT
from t1
window w1 as (partition by c), w1 as (order by pk);

--error ER_WRONG_WINDOW_SPEC_NAME
select 
  pk, c, 
  count(*) over (w2 rows between 2 preceding and 2 following) as CNT
from t1
window w1 as (partition by c), w2 as (w partition by c order by pk);

--error ER_PARTITION_LIST_IN_REFERENCING_WINDOW_SPEC
select 
  pk, c, 
  count(*) over (w2 rows between 2 preceding and 2 following) as CNT
from t1
window w1 as (partition by c), w2 as (w1 partition by c order by pk);

--error ER_ORDER_LIST_IN_REFERENCING_WINDOW_SPEC
select 
  pk, c, 
  count(*) over (w2 rows between 2 preceding and 2 following) as CNT
from t1
window w1 as (partition by c order by pk), w2 as (w1 order by pk);

--error ER_WINDOW_FRAME_IN_REFERENCED_WINDOW_SPEC
select 
  pk, c, 
  count(*) over w3 as CNT
from t1
window
  w1 as (partition by c), 
  w2 as (w1 order by pk rows between 3 preceding and 2 following),
  w3 as (w2 rows between 2 preceding and 2 following);

--error ER_BAD_COMBINATION_OF_WINDOW_FRAME_BOUND_SPECS
select 
  pk, c, 
  count(*) over w1 as CNT
from t1
window w1 as (partition by c order by pk 
              rows between unbounded following and 2 following);

--error ER_BAD_COMBINATION_OF_WINDOW_FRAME_BOUND_SPECS
select 
  pk, c, 
  count(*) over (w1 rows between 2 preceding and unbounded preceding) as CNT
from t1
window w1 as (partition by c order by pk);

--error ER_BAD_COMBINATION_OF_WINDOW_FRAME_BOUND_SPECS
select 
  pk, c, 
  count(*) over (w1 order by pk rows between current row and 2 preceding) as CNT
from t1
window w1 as (partition by c);

--error ER_BAD_COMBINATION_OF_WINDOW_FRAME_BOUND_SPECS
select 
  pk, c, 
  count(*) over (w2 rows between 2 following and current row) as CNT
from t1
window w1 as (partition by c), w2 as (w1 order by pk);

--error ER_WRONG_PLACEMENT_OF_WINDOW_FUNCTION 
select 
  pk, c 
from t1 where rank() over w1 > 2
window w1 as (partition by c order by pk);

--error ER_WRONG_PLACEMENT_OF_WINDOW_FUNCTION 
select
  c, max(pk) as m
from t1 
  group by c + rank() over w1
window w1 as (order by m);

--error ER_WRONG_PLACEMENT_OF_WINDOW_FUNCTION 
select
  c, max(pk) as m, rank() over w1 as r 
from t1 
  group by c+r
window w1 as (order by m);

--error ER_WRONG_PLACEMENT_OF_WINDOW_FUNCTION 
select
  c, max(pk) as m, rank() over w1 as r
from t1 
  group by c having c+r > 3
window w1 as (order by m);

--error ER_WINDOW_FUNCTION_IN_WINDOW_SPEC 
select
  c, max(pk) as m, rank() over w1 as r, 
    rank() over (partition by r+1 order by m) 
from t1 
  group by c
window w1 as (order by m);

--error ER_WINDOW_FUNCTION_IN_WINDOW_SPEC 
select
  c, max(pk) as m, rank() over w1 as r, 
    rank() over (partition by m order by r) 
from t1 
  group by c
window w1 as (order by m);

--error ER_WINDOW_FUNCTION_IN_WINDOW_SPEC 
select
  c, max(pk) as m, rank() over w1 as r, dense_rank() over w2 as dr  
from t1 
  group by c
window w1 as (order by m), w2 as (partition by r order by m);

--error ER_NOT_ALLOWED_WINDOW_FRAME
select 
  pk, c, 
  row_number() over (partition by c order by pk 
                     range between unbounded preceding and current row) as r 
from t1;

--error ER_NOT_ALLOWED_WINDOW_FRAME
select 
  pk, c, 
  rank() over w1 as r
from t1
window w1 as (partition by c order by pk 
              rows between 2 preceding and 2 following);

--error ER_NOT_ALLOWED_WINDOW_FRAME
select 
  pk, c, 
  dense_rank() over (partition by c order by pk
                    rows between 1 preceding and 1 following) as r
from t1;

--error ER_NO_ORDER_LIST_IN_WINDOW_SPEC
select 
  pk, c, 
  rank() over w1 as r
from t1
window w1 as (partition by c);

--error ER_NO_ORDER_LIST_IN_WINDOW_SPEC
select 
  pk, c, 
  dense_rank() over (partition by c) as r
from t1;

drop table t0,t1;

--echo #
--echo # MDEV-9634: Window function produces incorrect value
--echo #

create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (part_id int, pk int, a int);
insert into t2 select 
  if(a<5, 0, 1), a, if(a<5, NULL, 1) from t0;
select * from t2;

select 
  part_id, pk, a,
  count(a) over (partition by part_id order by pk
                 rows between 1 preceding and 1 following) as CNT
from t2;

drop table t0, t2;

--echo #
--echo #  RANGE-type bounds 
--echo #

create table t3 (
  pk int, 
  val int
);

insert into t3 values
(0, 1),
(1, 1),
(2, 1),
(3, 2),
(4, 2),
(5, 2),
(6, 2);

select 
  pk, 
  val,
  count(val) over (order by val 
                 range between current row and 
                               current row) 
  as CNT
from t3;

insert into t3 values 
(7, 3),
(8, 3);

select 
  pk, 
  val,
  count(val) over (order by val 
                 range between current row and 
                               current row) 
  as CNT
from t3;

drop table t3;

--echo # Now, check with PARTITION BY
create table t4 (
  part_id int,
  pk int,
  val int
);

insert into t4 values
(1234, 100, 1),
(1234, 101, 1),
(1234, 102, 1),
(1234, 103, 2),
(1234, 104, 2),
(1234, 105, 2),
(1234, 106, 2),
(1234, 107, 3),
(1234, 108, 3),

(5678, 200, 1),
(5678, 201, 1),
(5678, 202, 1),
(5678, 203, 2),
(5678, 204, 2),
(5678, 205, 2),
(5678, 206, 2),
(5678, 207, 3),
(5678, 208, 3);

select 
  part_id,
  pk, 
  val,
  count(val) over (partition by part_id
                   order by val 
                   range between current row and 
                               current row) 
  as CNT
from t4;

--echo #
--echo # Try RANGE UNBOUNDED PRECEDING | FOLLOWING
--echo #
select 
  part_id,
  pk, 
  val,
  count(val) over (partition by part_id
                   order by val 
                   range between unbounded preceding and 
                               current row) 
  as CNT
from t4;

select 
  part_id,
  pk, 
  val,
  count(val) over (partition by part_id
                   order by val 
                   range between current row and 
                                 unbounded following) 
  as CNT
from t4;

select 
  part_id,
  pk, 
  val,
  count(val) over (partition by part_id
                   order by val 
                   range between unbounded preceding and 
                                 unbounded following) 
  as CNT
from t4;

drop table t4;

--echo #
--echo # MDEV-9695: Wrong window frame when using RANGE BETWEEN N FOLLOWING AND PRECEDING
--echo #
create table t1 (pk int, a int, b int);
insert into t1 values
( 1 , 0, 1),
( 2 , 0, 2),
( 3 , 1, 4),
( 4 , 1, 8),
( 5 , 2, 32),
( 6 , 2, 64),
( 7 , 2, 128),
( 8 , 2, 16);
 
select pk, a, b,
bit_or(b) over (partition by a order by pk ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING) as bit_or
from t1;

--echo # Extra ROWS n PRECEDING tests 
select pk, a, b,
bit_or(b) over (partition by a order by pk ROWS BETWEEN 1 PRECEDING AND 1 PRECEDING) as bit_or
from t1;
drop table t1;


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

insert into t2 values
( 1, 0, 1),
( 2, 0, 2),
( 3, 0, 4),
( 4, 0, 8),
( 5, 1, 16),
( 6, 1, 32),
( 7, 1, 64),
( 8, 1, 128),
( 9, 2, 256),
(10, 2, 512),
(11, 2, 1024),
(12, 2, 2048);

select pk, a, b,
bit_or(b) over (partition by a order by pk ROWS BETWEEN 1 PRECEDING AND 1 PRECEDING) as bit_or
from t2;

select pk, a, b,
bit_or(b) over (partition by a order by pk ROWS BETWEEN 2 PRECEDING AND 2 PRECEDING) as bit_or
from t2;

select pk, a, b,
bit_or(b) over (partition by a order by pk ROWS BETWEEN 2 PRECEDING AND 1 PRECEDING) as bit_or
from t2;

--echo # Check CURRENT ROW 

select pk, a, b,
bit_or(b) over (partition by a order by pk ROWS BETWEEN CURRENT ROW AND CURRENT ROW) as bit_or
from t2;

drop table t2;

--echo #
--echo # Try RANGE PRECEDING|FOLLWING n
--echo #
create table t1 (
  part_id int,
  pk int,
  a int
);

insert into t1 values 
(10, 1, 1),
(10, 2, 2),
(10, 3, 4),
(10, 4, 8),
(10, 5,26), 
(10, 6,27),
(10, 7,40),
(10, 8,71),
(10, 9,72);

select
  pk, a,
  count(a) over (ORDER BY a
                 RANGE BETWEEN UNBOUNDED PRECEDING 
                 AND 10 FOLLOWING) as cnt
from t1;

select
  pk, a,
  count(a) over (ORDER BY a DESC
                 RANGE BETWEEN UNBOUNDED PRECEDING 
                 AND 10 FOLLOWING) as cnt
from t1;

select
  pk, a,
  count(a) over (ORDER BY a
                 RANGE BETWEEN UNBOUNDED PRECEDING 
                 AND 1 FOLLOWING) as cnt
from t1;

select
  pk, a,
  count(a) over (ORDER BY a
                 RANGE BETWEEN UNBOUNDED PRECEDING 
                 AND 10 PRECEDING) as cnt
from t1;

select
  pk, a,
  count(a) over (ORDER BY a DESC
                 RANGE BETWEEN UNBOUNDED PRECEDING 
                 AND 10 PRECEDING) as cnt
from t1;

select
  pk, a,
  count(a) over (ORDER BY a
                 RANGE BETWEEN UNBOUNDED PRECEDING 
                 AND 1 PRECEDING) as cnt
from t1;

# Try bottom bound 
select
  pk, a,
  count(a) over (ORDER BY a
                 RANGE BETWEEN 1 PRECEDING 
                 AND CURRENT ROW) as cnt
from t1;

select
  pk, a,
  count(a) over (ORDER BY a DESC
                 RANGE BETWEEN 1 PRECEDING 
                 AND CURRENT ROW) as cnt
from t1;

select
  pk, a,
  count(a) over (ORDER BY a
                 RANGE BETWEEN 1 FOLLOWING 
                 AND 3 FOLLOWING) as cnt
from t1;

--echo # Try CURRENT ROW with[out] DESC
select
  pk, a,
  count(a) over (ORDER BY a
                 RANGE BETWEEN CURRENT ROW
                 AND 1 FOLLOWING) as cnt
from t1;

select
  pk, a,
  count(a) over (order by a desc
                 range between current row
                 and 1 following) as cnt
from t1;


# Try with partitions
insert into t1 select 22, pk, a from t1;
select
  part_id, pk, a,
  count(a) over (PARTITION BY part_id
                 ORDER BY a
                 RANGE BETWEEN UNBOUNDED PRECEDING 
                 AND 10 FOLLOWING) as cnt
from t1;

select
  pk, a,
  count(a) over (PARTITION BY part_id
                 ORDER BY a
                 RANGE BETWEEN UNBOUNDED PRECEDING 
                 AND 1 PRECEDING) as cnt
from t1;

drop table t1;

--echo # Try a RANGE frame over non-integer datatype:

create table t1 (
  col1 int,
  a decimal(5,3)
);

insert into t1 values (1, 0.45);
insert into t1 values (1, 0.5);
insert into t1 values (1, 0.55);
insert into t1 values (1, 1.21);
insert into t1 values (1, 1.22);
insert into t1 values (1, 3.33);

select
  a, 
  count(col1) over (order by a 
                    range between 0.1 preceding 
                                  and 0.1 following) 
from t1;

drop table t1;

--echo # 
--echo # RANGE-type frames and NULL values 
--echo # 
create table t1 (
 pk int,
 a int,
 b int
);

insert into t1 values (1, NULL,1);
insert into t1 values (2, NULL,1);
insert into t1 values (3, NULL,1);
insert into t1 values (4, 10 ,1);
insert into t1 values (5, 11 ,1);
insert into t1 values (6, 12 ,1);
insert into t1 values (7, 13 ,1);
insert into t1 values (8, 14 ,1);


select 
 pk, a, 
 count(b) over (order by a 
                range between 2 preceding 
                          and 2 following) as CNT
from t1;
drop table t1;

--echo # 
--echo #  Try ranges that have bound1 > bound2.  The standard actually allows them
--echo # 

create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

create table t1 (pk int, c int);
insert into t1 select a+1,1 from t0;
update t1 set c=2 where pk not in (1,2,3,4);
select * from t1;

select
  pk, c,
  count(*) over (partition by c
                 order by pk
                 rows between 1 preceding
                          and 2 preceding) 
                as cnt
from t1;


select
  pk, c,
  count(*) over (partition by c
                 order by pk
                 range between 1 preceding
                           and 2 preceding) 
                as cnt
from t1;
drop table t0, t1;

--echo #
--echo # Error checking for frame bounds
--echo #

create table t1 (a int, b int, c varchar(32));
insert into t1 values (1,1,'foo');
insert into t1 values (2,2,'bar');
--error ER_RANGE_FRAME_NEEDS_SIMPLE_ORDERBY
select 
  count(*) over (order by a,b
                 range between unbounded preceding and current row)
from t1;

--error ER_WRONG_TYPE_FOR_RANGE_FRAME
select
  count(*) over (order by c
                 range between unbounded preceding and current row)
from t1;

--error ER_WRONG_TYPE_FOR_RANGE_FRAME
select
  count(*) over (order by a
                 range between 'abcd' preceding and current row)
from t1;

--error ER_WRONG_TYPE_FOR_RANGE_FRAME
select
  count(*) over (order by a
                 range between current row and 'foo' following)
from t1;

--echo # Try range frame with invalid bounds
--error ER_WRONG_TYPE_FOR_ROWS_FRAME
select
  count(*) over (order by a
                 rows between 0.5 preceding and current row)
from t1;

--error ER_WRONG_TYPE_FOR_ROWS_FRAME
select
  count(*) over (order by a
                 rows between current row and 3.14 following)
from t1;

--echo #
--echo # EXCLUDE clause is parsed but not supported 
--echo #

--error ER_FRAME_EXCLUSION_NOT_SUPPORTED
select
  count(*) over (order by a
                 rows between 1 preceding and 1 following
                 exclude current row)
from t1;

--error ER_FRAME_EXCLUSION_NOT_SUPPORTED
select
  count(*) over (order by a
                 range between 1 preceding and 1 following
                 exclude ties)
from t1;

--error ER_FRAME_EXCLUSION_NOT_SUPPORTED
select
  count(*) over (order by a
                 range between 1 preceding and 1 following
                 exclude group)
from t1;

# EXCLUDE NO OTHERS means 'don't exclude anything'
select
  count(*) over (order by a
                 rows between 1 preceding and 1 following
                 exclude no others)
from t1;

drop table t1;

--echo # 
--echo #  Window function in grouping query 
--echo # 

create table t1 (
  username  varchar(32),
  amount int
);
 
insert into t1 values
('user1',1),
('user1',5),
('user1',3),
('user2',10),
('user2',20),
('user2',30);
 
select 
  username,
  sum(amount) as s, 
  rank() over (order by s desc)
from t1
group by username;

drop table t1;

--echo # 
--echo #  mdev-9719: Window function in prepared statement 
--echo # 

create table t1(a int, b int, x char(32));
insert into t1 values (2, 10, 'xx');
insert into t1 values (2, 10, 'zz');
insert into t1 values (2, 20, 'yy');
insert into t1 values (3, 10, 'xxx');
insert into t1 values (3, 20, 'vvv');
 
prepare stmt from 'select a, row_number() over (partition by a order by b) from t1';
execute stmt;

drop table t1;

--echo # 
--echo #  mdev-9754: Window name resolution in prepared statement 
--echo # 

create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
 
create table t1 (pk int, c int);
insert into t1 select a+1,1 from t0;
update t1 set c=2 where pk not in (1,2,3,4);
select * from t1;
 
prepare stmt from 
'select 
  pk, c, 
  count(*) over w1 as CNT
from t1
window w1 as (partition by c order by pk 
              rows between 2 preceding and 2 following)';
execute stmt;

drop table t0,t1;

--echo #
--echo # EXPLAIN FORMAT=JSON support for window functions
--echo #
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

explain format=json select rank() over (order by a) from t0;

create table t1 (a int, b int, c int);
insert into t1 select a,a,a from t0;

explain format=json
select
  a,
  rank() over (order by sum(b))
from t1
group by a;

explain format=json
select
  a,
  rank() over (order by sum(b))
from t1
group by a
order by null;

--echo #
--echo # Check how window function works together with GROUP BY and HAVING
--echo #

select b,max(a) as MX, rank() over (order by b) from t1 group by b having MX in (3,5,7);
explain format=json
select b,max(a) as MX, rank() over (order by b) from t1 group by b having MX in (3,5,7);

drop table t1;
drop table t0;

--echo #
--echo # Building ordering index for window functions
--echo #

create table t1 (
  pk int primary key,
  a int,
  b int,
  c  int
);

insert into t1 values
(101 , 0, 10, 1),
(102 , 0, 10, 2),
(103 , 1, 10, 3),
(104 , 1, 10, 4),
(108 , 2, 10, 5),
(105 , 2, 20, 6),
(106 , 2, 20, 7),
(107 , 2, 20, 8),
(109 , 4, 20, 9),
(110 , 4, 20, 10),
(111 , 5, NULL, 11),
(112 , 5, 1, 12),
(113 , 5, NULL, 13),
(114 , 5, NULL, 14),
(115 , 5, NULL, 15),
(116 , 6, 1, NULL),
(117 , 6, 1, 10),
(118 , 6, 1, 1),
(119 , 6, 1, NULL),
(120 , 6, 1, NULL),
(121 , 6, 1, NULL),
(122 , 6, 1, 2),
(123 , 6, 1, 20),
(124 , 6, 1, -10),
(125 , 6, 1, NULL),
(126 , 6, 1, NULL),
(127 , 6, 1, NULL);

--sorted_result
select sum(b) over (partition by a order by b,pk
                    rows between unbounded preceding  and current row) as c1,
       avg(b) over (w1 rows between 1 preceding and 1 following) as c2,
       sum(c) over (w2 rows between 1 preceding and 1 following) as c5,  
       avg(b) over (w1 rows between 5 preceding and 5 following) as c3,
       sum(b) over (w1 rows between 1 preceding and 1 following) as c4
from t1 
window w1 as (partition by a order by b,pk),
       w2 as (partition by b order by c,pk);

drop table t1;


--echo #
--echo # MDEV-9848: Window functions: reuse sorting and/or scanning
--echo #

create table t1 (a int, b int, c int);
insert into t1 values 
(1,3,1),
(2,2,1),
(3,1,1);

--echo #  Check using counters
flush status;
select 
  rank() over (partition by c order by a),
  rank() over (partition by c order by b)
from t1;
show status like '%sort%';

flush status;
select 
  rank() over (partition by c order by a),
  rank() over (partition by c order by a)
from t1;
show status like '%sort%';

# Check using EXPLAIN FORMAT=JSON 
explain format=json
select 
  rank() over (partition by c order by a),
  rank() over (partition by c order by a)
from t1;

explain format=json
select 
  rank() over (order by a),
  row_number() over (order by a)
from t1;

explain format=json
select 
  rank() over (partition by c order by a),
  count(*) over (partition by c)
from t1;

explain format=json
select 
  count(*) over (partition by c),
  rank() over (partition by c order by a)
from t1;

drop table t1;


--echo #
--echo # MDEV-9847: Window functions: crash with big_tables=1
--echo #
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
set @tmp=@@big_tables;
set big_tables=1;
select rank() over (order by a) from t1;
set big_tables=@tmp;
drop table t1;

--echo #
--echo # Check if "ORDER BY window_func" works
--echo #

create table t1 (s1 int, s2 char(5));
insert into t1 values (1,'a');
insert into t1 values (null,null);
insert into t1 values (1,null);
insert into t1 values (null,'a');
insert into t1 values (2,'b');
insert into t1 values (-1,'');

explain format=json
select *, row_number() over (order by s1, s2) as X from t1 order by X desc;
select *, row_number() over (order by s1, s2) as X from t1 order by X desc;
drop table t1;

--echo #
--echo # Try window functions that are not directly present in the select list
--echo #
create table t1 (a int, b int);
insert into t1 values 
  (1,3),
  (2,2),
  (3,1);

select 
  rank() over (order by a) -
  rank() over (order by b)
from
  t1;

drop table t1;

--echo #
--echo # MDEV-9894: Assertion `0' failed in Window_func_runner::setup
--echo #  return ER_NOT_SUPPORTED_YET for aggregates that are not yet supported
--echo #  as window functions.
--echo #
create table t1 (i int);
insert into t1 values (1),(2);
--error ER_NOT_SUPPORTED_YET
SELECT MAX(i) OVER (PARTITION BY (i)) FROM t1;
drop table t1;

--echo #
--echo # Check the 0 in ROWS 0 PRECEDING
--echo #

create table t1 (
  part_id int,
  pk int,
  a int
);

insert into t1 values (1, 1, 1);
insert into t1 values (1, 2, 2);
insert into t1 values (1, 3, 4);
insert into t1 values (1, 4, 8);

select 
  pk, a,
  sum(a) over (order by pk rows between 0 preceding and current row)
from t1;

select 
  pk, a, 
  sum(a) over (order by pk rows between 1 preceding and 0 preceding)
from t1;

insert into t1 values (200, 1, 1);
insert into t1 values (200, 2, 2);
insert into t1 values (200, 3, 4);
insert into t1 values (200, 4, 8);
select 
  part_id, pk, a,
  sum(a) over (partition by part_id order by pk rows between 0 preceding and current row)
from t1;

select 
  part_id, pk, a, 
  sum(a) over (partition by part_id order by pk rows between 1 preceding and 0 preceding)
from t1;

drop table t1;
--echo #
--echo # MDEV-9780, The "DISTINCT must not bet converted into GROUP BY when
--echo #                 window functions are present" part 
--echo #

create table t1 (part_id int, a int);
insert into t1 values
(100, 1),
(100, 2),
(100, 2),
(100, 3),
(2000, 1),
(2000, 2),
(2000, 3),
(2000, 3),
(2000, 3);

select          rank() over (partition by part_id order by a) from t1;
select distinct rank() over (partition by part_id order by a) from t1;
explain format=json
select distinct rank() over (partition by part_id order by a) from t1;

drop table t1;