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[CBRD-25785] Added test case for view merge issue with ORDER BY in subquery and rownum in main query #2076

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[CBRD-25785] Added test case for view merge issue with ORDER BY in subquery and rownum in main query #2076

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16ff99c
add testcase for cbrd-25785
zionyun Feb 6, 2025
50ca22c
add answer file
zionyun Feb 6, 2025
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103 changes: 103 additions & 0 deletions sql/_33_elderberry/cbrd_24042/cbrd_25785/answers/cbrd_25785.answer
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case1

===================================================
rownum c1 c2
10 10 10
9 9 9
8 8 8
7 7 7
6 6 6
5 5 5
4 4 4
3 3 3
2 2 2
1 1 1

===================================================

case2

===================================================
orderby_num() c1 c2
1 10 10
2 9 9
3 8 8
4 7 7
5 6 6
6 5 5
7 4 4
8 3 3
9 2 2
10 1 1

===================================================

case3

===================================================
rownum c1 c2
9 9 9
8 8 8
7 7 7
6 6 6
5 5 5
4 4 4
3 3 3
2 2 2
1 1 1

===================================================

case4

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orderby_num() c1 c2
1 2 2
2 4 4
3 6 6
4 8 8
5 10 10

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case5

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rownum orderby_num() c1 c2
8 1 8 8
7 2 7 7
6 3 6 6
5 4 5 5
4 5 4 4
3 6 3 3
2 7 2 2
1 8 1 1

===================================================
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37 changes: 37 additions & 0 deletions sql/_33_elderberry/cbrd_24042/cbrd_25785/cases/cbrd_25785.sql
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-- Verified for CBRD-25785
-- Problem with view merging when ORDER BY clause in the subquery and the main query, and rownum is in the main query select list.

drop table if exists t1;
create table t1 (c1 int, c2 int);
insert into t1 values (9, 9);
insert into t1 values (10, 10);
insert into t1 values (7, 7);
insert into t1 values (8, 8);
insert into t1 values (5, 5);
insert into t1 values (6, 6);
insert into t1 values (3, 3);
insert into t1 values (4, 4);
insert into t1 values (1, 1);
insert into t1 values (2, 2);

--case1: Basic Combination of rownum and ORDER BY
evaluate 'case1';
select /*+ recompile */ rownum, c1, c2 from (select c1, c2 from t1 where c1 > 0 order by c1) order by c2 desc;

--case2: Example Using orderby_num()
evaluate 'case2';
select /*+ recompile */ orderby_num(), c1, c2 from (select c1, c2 from t1 where c1 > 0 order by c2) order by c1 desc;

--case3: Using rownum with Multiple ORDER BY Clauses
evaluate 'case3';
select /*+ recompile */ rownum, c1, c2 from (select c1, c2 from t1 where c2 < 10 order by c1) order by c2 desc, c1 asc;

--case4: orderby_num() with Additional Conditions
evaluate 'case4';
select /*+ recompile */ orderby_num(), c1, c2 from (select c1, c2 from t1 where c1 % 2 = 0 order by c2 desc) order by c1 asc;

--case5: Using Both rownum and orderby_num() Together
evaluate 'case5';
select /*+ recompile */ rownum, orderby_num(), c1, c2 from (select c1, c2 from t1 where c1 between 1 and 8 order by c1) order by c2 desc;

drop table if exists t1;