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[CBRD-25098] Improved test query for the problem where inst_num() is inappropriately changed to order_by_num() when a subquery containing an ORDER BY is view merged (11.4) #1730

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[CBRD-25098] Improved test query for the problem where inst_num() is inappropriately changed to order_by_num() when a subquery containing an ORDER BY is view merged (11.4) #1730

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92 changes: 76 additions & 16 deletions sql/_13_issues/_24_1h/answers/cbrd_25098.answer
100644 → 100755
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Original file line number Diff line number Diff line change
Expand Up @@ -72,10 +72,10 @@ select tbl.col_two, tbl.col_three, groupby_num(), (select d?.col_two from ((sele
===================================================
3
===================================================
rownum test
1 1
2 2
3 3
rownum 'view merge 1' test
1 view merge 1 1
2 view merge 1 2
3 view merge 1 3

Query plan:
sscan
Expand All @@ -92,10 +92,10 @@ temp(order by)
sort: ? asc
cost: ? card ?
Query stmt:
select (orderby_num()), (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? )), X.col_one from tbl_one X order by ?
select (orderby_num()), 'view merge ?', (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? )), X.col_one from tbl_one X order by ?
===================================================
rownum test
1 1
rownum 'view merge 1 + limit' test
1 view merge 1 + limit 1

Query plan:
sscan
Expand All @@ -112,12 +112,12 @@ temp(order by)
sort: ? asc
cost: ? card ?
Query stmt:
select (orderby_num()), (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? )), X.col_one from tbl_one X order by ? for (orderby_num())<= ?:?
select (orderby_num()), 'view merge ? + limit', (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? )), X.col_one from tbl_one X order by ? for (orderby_num())<= ?:?
===================================================
rownum test
1 1
2 2
3 3
rownum 'view merge 2' test
1 view merge 2 1
2 view merge 2 2
3 view merge 2 3

Query plan:
sscan
Expand All @@ -143,10 +143,10 @@ temp(order by)
sort: ? asc
cost: ? card ?
Query stmt:
select (orderby_num()), (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=a_? and (rownum= ?:? )), a_? from (select t_one.col_one from tbl_one t_one group by t_one.col_one) X (a_?) order by ?
select (orderby_num()), 'view merge ?', (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=a_? and (rownum= ?:? )), a_? from (select t_one.col_one from tbl_one t_one group by t_one.col_one) X (a_?) order by ?
===================================================
rownum test
1 1
rownum 'view merge 2 + limit' test
1 view merge 2 + limit 1

Query plan:
sscan
Expand All @@ -172,6 +172,66 @@ temp(order by)
sort: ? asc
cost: ? card ?
Query stmt:
select (orderby_num()), (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=a_? and (rownum= ?:? )), a_? from (select t_one.col_one from tbl_one t_one group by t_one.col_one) X (a_?) order by ? for (orderby_num())<= ?:?
select (orderby_num()), 'view merge ? + limit', (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=a_? and (rownum= ?:? )), a_? from (select t_one.col_one from tbl_one t_one group by t_one.col_one) X (a_?) order by ? for (orderby_num())<= ?:?
===================================================
'view merge 3' col_three
view merge 3 1

Query plan:
sscan
class: tbl_two node[?]
sargs: term[?] AND term[?]
cost: ? card ?
Query stmt:
(select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? ))
Query plan:
sscan
class: X node[?]
sargs: term[?]
cost: ? card ?
Query stmt:
(select (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? )) from tbl_one X where (rownum= ?:? ))
Query plan:
sscan
class: tbl_two node[?]
sargs: term[?]
cost: ? card ?
Query stmt:
select 'view merge ?', tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=(select (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? )) from tbl_one X where (rownum= ?:? ))
===================================================
'view merge 3 + limit' col_three
view merge 3 + limit 1

Query plan:
sscan
class: tbl_two node[?]
sargs: term[?] AND term[?]
cost: ? card ?
Query stmt:
(select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? ))
Query plan:
temp(order by)
subplan: sscan
class: t_one node[?]
sargs: term[?]
cost: ? card ?
sort: ? asc
cost: ? card ?
Query stmt:
(select t_one.col_one from tbl_one t_one where (rownum= ?:? ) order by ?)
Query plan:
sscan
class: X node[?]
sargs: term[?]
cost: ? card ?
Query stmt:
(select (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? )) from (select t_one.col_one from tbl_one t_one where (rownum= ?:? ) order by ?) X (col_one) where (inst_num()<= ?:? ))
Query plan:
sscan
class: tbl_two node[?]
sargs: term[?]
cost: ? card ?
Query stmt:
select 'view merge ? + limit', tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=(select (select tbl_two.col_three from tbl_two tbl_two where tbl_two.col_three=X.col_one and (rownum= ?:? )) from (select t_one.col_one from tbl_one t_one where (rownum= ?:? ) order by ?) X (col_one) where (inst_num()<= ?:? ))
===================================================
0
61 changes: 61 additions & 0 deletions sql/_13_issues/_24_1h/cases/cbrd_25098.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@ insert into tbl_two values (1,1),(2,2),(3,3);
SELECT
/*+ RECOMPILE */
rownum,
'view merge 1',
(
SELECT
col_three
Expand All @@ -63,6 +64,7 @@ FROM
SELECT
/*+ RECOMPILE */
rownum,
'view merge 1 + limit',
(
SELECT
col_three
Expand All @@ -84,6 +86,7 @@ limit 1;
SELECT
/*+ RECOMPILE */
rownum,
'view merge 2',
(
SELECT
col_three
Expand Down Expand Up @@ -111,6 +114,7 @@ FROM
SELECT
/*+ RECOMPILE */
rownum,
'view merge 2 + limit',
(
SELECT
col_three
Expand All @@ -135,6 +139,63 @@ FROM
) X
limit 1;

-- view merge 3 (in nested subquery)
SELECT
/*+ RECOMPILE */
'view merge 3',
col_three
FROM tbl_two
WHERE
col_three =
(
SELECT
(
SELECT
col_three
FROM tbl_two
WHERE
col_three = X.col_one
AND ROWNUM = 1
) AS test
FROM
(
SELECT
t_one.col_one
FROM tbl_one t_one
WHERE ROWNUM = 1
ORDER BY t_one.col_one
) X
)
;

-- view merge 3 (in nested subquery) + limit
SELECT
/*+ RECOMPILE */
'view merge 3 + limit',
col_three
FROM tbl_two
WHERE
col_three =
(
SELECT
(
SELECT
col_three
FROM tbl_two
WHERE
col_three = X.col_one
AND ROWNUM = 1
) AS test
FROM
(
SELECT
t_one.col_one
FROM tbl_one t_one
WHERE ROWNUM = 1
ORDER BY t_one.col_one
) X limit 1
)
;


drop table tbl, tbl_one, tbl_two;