Maksim Zhuravkov created IGNITE-22392:
-----------------------------------------
Summary: Sql. Set operation. Incorrect query transformation for a
query with limit / offset that uses the same table (When RemoveSortInSubQuery
is enabled)
Key: IGNITE-22392
URL: https://issues.apache.org/jira/browse/IGNITE-22392
Project: Ignite
Issue Type: Bug
Components: sql
Reporter: Maksim Zhuravkov
Combination of LIMIT / OFFSET and set operator results in incorrect
transformation of a plan tree. This issue is caused by incorrect by incorrect
handling of the `RemoveSortInSubQuery` flag inside SqlToRelConverter internals.
ATM this issue is migrated by disabling that flag.
{noformat}
statement ok
CREATE TABLE test (a INTEGER);
statement ok
INSERT INTO test VALUES (1), (2), (3), (4);
# query 1
query I rowsort
SELECT a FROM
(SELECT a FROM test ORDER BY a LIMIT 1 OFFSET 1) t(a)
----
2
# query 2
query I rowsort
SELECT a FROM
(SELECT a FROM
(SELECT a FROM test ORDER BY a LIMIT 3 OFFSET 2) i(a)
ORDER BY a OFFSET 1
) t(a)
----
4
# combined query should return 2, 4
# but it returns 2
query I rowsort
SELECT a FROM
(SELECT a FROM test ORDER BY a LIMIT 1 OFFSET 1) t(a)
UNION ALL
SELECT a FROM
(SELECT a FROM
(SELECT a FROM test ORDER BY a LIMIT 3 OFFSET 2) i(a)
ORDER BY a OFFSET 1
) t(a)
----
2
4
{noformat}
Query 1
{noformat}
SELECT a FROM
(SELECT a FROM test ORDER BY a LIMIT 1 OFFSET 1) t(a)
Limit(offset=[1], fetch=[1]), id = 80
Exchange(distribution=[single]), id = 79
Sort(sort0=[$0], dir0=[ASC], offset=[1], fetch=[1]), id = 78
TableScan(table=[[PUBLIC, TEST]], requiredColumns=[{0}]), id = 50
{noformat}
Query 2
{noformat}
SELECT a FROM
(SELECT a FROM
(SELECT a FROM test ORDER BY a LIMIT 3 OFFSET 2) i(a)
ORDER BY a OFFSET 1
) t(a)
Limit(offset=[1]), id = 201
Limit(offset=[2], fetch=[3]), id = 200
Exchange(distribution=[single]), id = 199
Sort(sort0=[$0], dir0=[ASC], offset=[2], fetch=[3]), id = 198
TableScan(table=[[PUBLIC, TEST]], requiredColumns=[{0}]), id = 168
{noformat}
Combine queries using UNION ALL
{noformat}
SELECT a FROM
(SELECT a FROM test ORDER BY a LIMIT 1 OFFSET 1) t(a)
UNION ALL
SELECT a FROM
(SELECT a FROM
(SELECT a FROM test ORDER BY a LIMIT 3 OFFSET 2) i(a)
ORDER BY a OFFSET 1
) t(a)
UnionAll(all=[true]), id = 403
Limit(offset=[1], fetch=[1]), id = 400
Exchange(distribution=[single]), id = 399 # subtree is duplicated in
another part of a query
Sort(sort0=[$0], dir0=[ASC], offset=[1], fetch=[1]), id = 398 #
TableScan(table=[[PUBLIC, TEST]], requiredColumns=[{0}]), id = 345
Limit(offset=[1]), id = 402
Limit(offset=[2], fetch=[3]), id = 401
Exchange(distribution=[single]), id = 399 # duplicate
Sort(sort0=[$0], dir0=[ASC], offset=[1], fetch=[1]), id = 398
TableScan(table=[[PUBLIC, TEST]], requiredColumns=[{0}]), id = 345
{noformat}
When tables are different, results are correct.
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