When the system property h2.nestedJoins was enabled, some outer joins returned the wrong result.

h2/src/main/org/h2/command/dml/Select.java

@@ -911,10 +911,10 @@ public class Select extends Query {
             if (on != null) {
                 if (!on.isEverything(ExpressionVisitor.EVALUATABLE_VISITOR)) {
                     if (SysProperties.NESTED_JOINS) {
-                        f.removeJoinCondition();
                         // need to check that all added are bound to a table
                         on = on.optimize(session);
                         if (!f.isJoinOuter() && !f.isJoinOuterIndirect()) {
+                            f.removeJoinCondition();
                             addCondition(on);
                         }
                     } else {

h2/src/test/org/h2/test/synth/TestNestedJoins.java

@@ -243,6 +243,20 @@ public class TestNestedJoins extends TestBase {
         ResultSet rs;
         String sql;
 
+        /*
+        create table test(id int primary key);
+        insert into test values(1);
+        select b.id from test a left outer join test b on a.id = b.id and not exists (select * from test c where c.id = b.id);
+        -- expected: null
+         */
+        stat.execute("create table test(id int primary key)");
+        stat.execute("insert into test values(1)");
+        rs = stat.executeQuery("select b.id from test a left outer join test b on a.id = b.id and not exists (select * from test c where c.id = b.id)");
+        assertTrue(rs.next());
+        sql = rs.getString(1);
+        assertEquals(null, sql);
+        stat.execute("drop table test");
+
         /*
         create table test(id int primary key);
         explain select * from test a left outer join (test c) on a.id = c.id;