For an outer join, then ON-clause constraints need to be evaluated at just

the right moment - not too early and not too late.  Fix for the problem
reported by [forum:/forumpost/3902c7b833|forum post 3902c7b833].

FossilOrigin-Name: 3869fd9a2b9483cbbf83d8f369c1744abc42f12e63abba402be35dd7e136161c

1 files changed, 37 insertions, 0 deletions

diff --git a/test/join8.test b/test/join8.test
index cccb167ac..554f04562 100644
--- a/test/join8.test
+++ b/test/join8.test
@@ -445,4 +445,41 @@ do_execsql_test join8-14020 {
   - 2 4
 }
 
+# 2022-05-30
+# https://sqlite.org/forum/forumpost/3902c7b833
+#
+reset_db
+do_execsql_test join8-15000 {
+  CREATE TABLE t1(x INT);
+  CREATE TABLE t2(y INT);
+  CREATE TABLE t3(z INT);
+  INSERT INTO t1 VALUES(10);
+  INSERT INTO t3 VALUES(20),(30);
+}
+do_execsql_test join8-15010 {
+  SELECT * FROM t1 LEFT JOIN t2 ON true JOIN t3 ON t2.y IS NOT NULL;
+} {}
+do_execsql_test join8-15020 {
+  SELECT * FROM t1 LEFT JOIN t2 ON true JOIN t3 ON t2.y IS NOT NULL
+   WHERE (t3.z!=400 AND t3.z!=500 AND t3.z!=600);
+} {}
+do_execsql_test join8-15100 {
+  PRAGMA automatic_index = 0;
+  CREATE TABLE t4(x TEXT);
+  CREATE TABLE t5(y TEXT);
+  CREATE TABLE t6(z TEXT);
+  INSERT INTO t4 VALUES('a'), ('b');
+  INSERT INTO t5 VALUES('b'), ('c');
+  INSERT INTO t6 VALUES('a'), ('d');
+} {}
+db null -
+do_execsql_test join8-15110 {
+  SELECT * FROM t4 LEFT JOIN t5 ON x=y LEFT JOIN t6 ON (x=z) ORDER BY +x;
+} {a - a b b -}
+do_execsql_test join8-15120 {
+  SELECT * FROM t4 LEFT JOIN t5 ON x=y LEFT JOIN t6 ON (x=z)
+   WHERE t5.y!='x' AND t4.x!='x';
+} {b b -}
+
+
 finish_test