Conditions of the form columnName IS NULL now use an index.

h2/src/test/org/h2/test/test-1.2.txt

@@ -3025,8 +3025,8 @@ inner join test2 on test1.id=test2.id left
 outer join test3 on test2.id=test3.id
 where test3.id is null;
 > PLAN
-> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-> SELECT TEST1.ID, TEST2.ID, TEST3.ID FROM PUBLIC.TEST1 /* PUBLIC.TEST1.tableScan */ INNER JOIN PUBLIC.TEST2 /* PUBLIC.PRIMARY_KEY_4C: ID = TEST1.ID AND ID = TEST1.ID */ ON 1=1 /* WHERE TEST1.ID = TEST2.ID */ LEFT OUTER JOIN PUBLIC.TEST3 /* PUBLIC.PRIMARY_KEY_4C0: ID = TEST2.ID */ ON TEST2.ID = TEST3.ID WHERE (TEST3.ID IS NULL) AND (TEST1.ID = TEST2.ID)
+> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+> SELECT TEST1.ID, TEST2.ID, TEST3.ID FROM PUBLIC.TEST1 /* PUBLIC.TEST1.tableScan */ INNER JOIN PUBLIC.TEST2 /* PUBLIC.PRIMARY_KEY_4C: ID = TEST1.ID AND ID = TEST1.ID */ ON 1=1 /* WHERE TEST1.ID = TEST2.ID */ LEFT OUTER JOIN PUBLIC.TEST3 /* PUBLIC.PRIMARY_KEY_4C0: ID = TEST2.ID AND ID = NULL */ ON TEST2.ID = TEST3.ID WHERE (TEST3.ID IS NULL) AND (TEST1.ID = TEST2.ID)
 > rows: 1
 
 insert into test1 select x from system_range(2, 1000);
@@ -3045,8 +3045,8 @@ inner join test2 on test1.id=test2.id
 left outer join test3 on test2.id=test3.id
 where test3.id is null;
 > PLAN
-> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
-> SELECT TEST1.ID, TEST2.ID, TEST3.ID FROM PUBLIC.TEST2 /* PUBLIC.TEST2.tableScan */ LEFT OUTER JOIN PUBLIC.TEST3 /* PUBLIC.PRIMARY_KEY_4C0: ID = TEST2.ID */ ON TEST2.ID = TEST3.ID INNER JOIN PUBLIC.TEST1 /* PUBLIC.PRIMARY_KEY_4: ID = TEST2.ID */ ON 1=1 WHERE (TEST3.ID IS NULL) AND (TEST1.ID = TEST2.ID)
+> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+> SELECT TEST1.ID, TEST2.ID, TEST3.ID FROM PUBLIC.TEST2 /* PUBLIC.TEST2.tableScan */ LEFT OUTER JOIN PUBLIC.TEST3 /* PUBLIC.PRIMARY_KEY_4C0: ID = TEST2.ID AND ID = NULL */ ON TEST2.ID = TEST3.ID INNER JOIN PUBLIC.TEST1 /* PUBLIC.PRIMARY_KEY_4: ID = TEST2.ID */ ON 1=1 WHERE (TEST3.ID IS NULL) AND (TEST1.ID = TEST2.ID)
 > rows: 1
 
 SELECT TEST1.ID, TEST2.ID, TEST3.ID
@@ -3221,8 +3221,8 @@ call /* remark * / * /* ** // end */ 1;
 > rows: 1
 
 call (select x from dual where x is null);
-> SELECT X FROM SYSTEM_RANGE(1, 1) /* PUBLIC.RANGE_INDEX */ /* scanCount: 2 */ WHERE X IS NULL
-> --------------------------------------------------------------------------------------------
+> SELECT X FROM SYSTEM_RANGE(1, 1) /* PUBLIC.RANGE_INDEX: X = NULL */ /* scanCount: 1 */ WHERE X IS NULL
+> ------------------------------------------------------------------------------------------------------
 > null
 > rows: 1