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Fix the query flattener so that it refuses a flattening that might leave both

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an inner-join and outer-join ON-clause constraint (or equivalent) on the same
term of the FROM clause.

FossilOrigin-Name: f6c4fb48b65c2e8659aa0a1119c330e8bad5e42b2db2030850bfc9c04afef5c8
This commit is contained in:
drh
2022-06-08 15:38:16 +00:00
parent 093dd41e97 5c118e3946
commit 40357f0d5d
6 changed files with 68 additions and 10 deletions
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34
test/join.test
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@ -1067,4 +1067,38 @@ do_catchsql_test join-26.1 {
SELECT * FROM t5 JOIN ((t4 JOIN (t5 JOIN t6)) t7);
} {/1 {.*}/}
# 2022-06-09 Invalid subquery flattening caused by
# check-in 3f45007d544e5f78 and detected by dbsqlfuzz
#
reset_db
do_execsql_test join-27.1 {
CREATE TABLE t1(a INT,b INT,c INT); INSERT INTO t1 VALUES(NULL,NULL,NULL);
CREATE TABLE t2(d INT,e INT); INSERT INTO t2 VALUES(NULL,NULL);
CREATE INDEX x2 ON t1(c,b);
CREATE TABLE t3(x INT); INSERT INTO t3 VALUES(NULL);
}
do_execsql_test join-27.2 {
WITH t99(b) AS MATERIALIZED (
SELECT b FROM t2 LEFT JOIN t1 ON c IN (SELECT x FROM t3)
)
SELECT 5 FROM t2 JOIN t99 ON b IN (1,2,3);
} {}
do_execsql_test join-27.3 {
WITH t99(b) AS NOT MATERIALIZED (
SELECT b FROM t2 LEFT JOIN t1 ON c IN (SELECT x FROM t3)
)
SELECT 5 FROM t2 JOIN t99 ON b IN (1,2,3);
} {}
do_execsql_test join-27.4 {
WITH t99(b) AS (SELECT b FROM t2 LEFT JOIN t1 ON c IN (SELECT x FROM t3))
SELECT 5 FROM t2 JOIN t99 ON b IN (1,2,3);
} {}
do_execsql_test join-27.5 {
SELECT 5
FROM t2 JOIN (
SELECT b FROM t2 LEFT JOIN t1 ON c IN (SELECT x FROM t3)
) AS t99 ON b IN (1,2,3);
} {}
finish_test