In memory database: outer joins with a condition "column is null" could return the wrong result.

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

@@ -768,9 +768,18 @@ public class Select extends Query {
         if (condition != null) {
             condition = condition.optimize(session);
             for (TableFilter f : filters) {
+                // outer joins: must not add index conditions such as
+                // "c is null" - example:
+                // create table parent(p int primary key) as select 1;
+                // create table child(c int primary key, pc int);
+                // insert into child values(2, 1);
+                // select p, c from parent
+                // left outer join child on p = pc where c is null;
+                if (!f.isJoinOuter() && !f.isJoinOuterIndirect()) {
                     condition.createIndexConditions(session, f);
                 }
             }
+        }
         if (isGroupQuery && groupIndex == null && havingIndex < 0 && filters.size() == 1) {
             if (condition == null) {
                 ExpressionVisitor optimizable = ExpressionVisitor.get(ExpressionVisitor.OPTIMIZABLE_MIN_MAX_COUNT_ALL);

h2/src/test/org/h2/test/db/TestCases.java

@@ -36,6 +36,7 @@ public class TestCases extends TestBase {
     }
 
     public void test() throws Exception {
+        testOuterJoin();
         testColumnWithConstraintAndComment();
         testTruncateConstraintsDisabled();
         testPreparedSubquery2();
@@ -83,6 +84,18 @@ public class TestCases extends TestBase {
         deleteDb("cases");
     }
 
+    private void testOuterJoin() throws SQLException {
+        deleteDb("cases");
+        Connection conn = getConnection("cases");
+        Statement stat = conn.createStatement();
+        stat.execute("create table parent(p int primary key) as select 1");
+        stat.execute("create table child(c int primary key, pc int) as select 2, 1");
+        ResultSet rs = stat.executeQuery("select * from parent left outer join child on p = pc where c is null");
+        assertFalse(rs.next());
+        stat.execute("drop all objects");
+        conn.close();
+    }
+
     private void testColumnWithConstraintAndComment() throws SQLException {
         if (config.memory) {
             return;