Manual merge

include/my_base.h

@@ -146,7 +146,13 @@ enum ha_extra_function {
     On-the-fly switching between unique and non-unique key inserting.
   */
   HA_EXTRA_CHANGE_KEY_TO_UNIQUE,
-  HA_EXTRA_CHANGE_KEY_TO_DUP
+  HA_EXTRA_CHANGE_KEY_TO_DUP,
+  /*
+    When using HA_EXTRA_KEYREAD, overwrite only key member fields and keep 
+    other fields intact. When this is off (by default) InnoDB will use memcpy
+    to overwrite entire row.
+  */
+  HA_EXTRA_KEYREAD_PRESERVE_FIELDS
 };
 
 	/* The following is parameter to ha_panic() */

include/my_bitmap.h

@@ -46,6 +46,8 @@ extern my_bool bitmap_is_set(const MY_BITMAP *map, uint bitmap_bit);
 extern my_bool bitmap_is_set_all(const MY_BITMAP *map);
 extern my_bool bitmap_is_subset(const MY_BITMAP *map1, const MY_BITMAP *map2);
 extern uint bitmap_set_next(MY_BITMAP *map);
+extern uint bitmap_get_first(const MY_BITMAP *map);
+extern uint bitmap_bits_set(const MY_BITMAP *map);
 extern void bitmap_clear_all(MY_BITMAP *map);
 extern void bitmap_clear_bit(MY_BITMAP *map, uint bitmap_bit);
 extern void bitmap_free(MY_BITMAP *map);

include/my_sys.h

@@ -748,6 +748,7 @@ extern byte *my_compress_alloc(const byte *packet, ulong *len, ulong *complen);
 extern ha_checksum my_checksum(ha_checksum crc, const byte *mem, uint count);
 extern uint my_bit_log2(ulong value);
 extern uint my_count_bits(ulonglong v);
+extern uint my_count_bits_ushort(ushort v);
 extern void my_sleep(ulong m_seconds);
 extern ulong crc32(ulong crc, const uchar *buf, uint len);
 extern uint my_set_max_open_files(uint files);

innobase/include/row0mysql.h

@@ -573,6 +573,10 @@ struct row_prebuilt_struct {
 					allocated mem buf start, because
 					there is a 4 byte magic number at the
 					start and at the end */
+	ibool		keep_other_fields_on_keyread; /* when using fetch 
+					cache with HA_EXTRA_KEYREAD, don't 
+					overwrite other fields in mysql row 
+					row buffer.*/
 	ulint		fetch_cache_first;/* position of the first not yet
 					fetched row in fetch_cache */
 	ulint		n_fetch_cached;	/* number of not yet fetched rows

innobase/row/row0sel.c

@@ -2571,10 +2571,35 @@ row_sel_pop_cached_row_for_mysql(
 					row */
 	row_prebuilt_t*	prebuilt)	/* in: prebuilt struct */
 {
+	ulint			i;
+	mysql_row_templ_t*	templ;
+	byte*			cached_rec;
         ut_ad(prebuilt->n_fetch_cached > 0);
 	
+	if (prebuilt->keep_other_fields_on_keyread)
+	{
+		/* Copy cache record field by field, don't touch fields that 
+		are not covered by current key */
+		cached_rec = 
+			prebuilt->fetch_cache[prebuilt->fetch_cache_first];
+
+		for (i = 0; i < prebuilt->n_template; i++) {
+			templ = prebuilt->mysql_template + i;
+			ut_memcpy(
+				buf + templ->mysql_col_offset, 
+				cached_rec + templ->mysql_col_offset,
+				templ->mysql_col_len);
+
+			if (templ->mysql_null_bit_mask)
+				buf[templ->mysql_null_byte_offset] &= 
+					cached_rec[templ->mysql_null_byte_offset];
+		}
+	}
+	else
+	{
 		ut_memcpy(buf, prebuilt->fetch_cache[prebuilt->fetch_cache_first],
 				prebuilt->mysql_row_len);
+	}
 	prebuilt->n_fetch_cached--;
 	prebuilt->fetch_cache_first++;
 

mysql-test/r/index_merge.result

@@ -21,7 +21,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain 
 select * from t0 where key1 < 3 or key2 > 1020;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	31	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	31	Using sort_union(i1,i2); Using where
 select * from t0 where key1 < 3 or key2 > 1020;
 key1	key2	key3	key4	key5	key6	key7	key8
 1	1	1	1	1	1	1	1023
@@ -32,11 +32,11 @@ key1	key2	key3	key4	key5	key6	key7	key8
 1024	1024	1024	1024	1024	1024	1024	0
 explain select * from t0 where key1 < 3 or key2 <4;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	7	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	7	Using sort_union(i1,i2); Using where
 explain
 select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	9	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	9	Using sort_union(i1,i2); Using where
 select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
 key1	key2	key3	key4	key5	key6	key7	key8
 31	31	31	31	31	31	31	993
@@ -56,18 +56,18 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	ref	i1,i2,i3	i3	4	const	1	Using where
 explain select * from t0 use index (i1,i2) where (key1 < 3 or key2 <4) and key3 = 50;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	7	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	7	Using sort_union(i1,i2); Using where
 explain select * from t0 where (key1 > 1 or key2  > 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	ALL	i1,i2	NULL	NULL	NULL	1024	Using where
 explain select * from t0 force index (i1,i2) where (key1 > 1 or key2  > 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	1024	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	1024	Using sort_union(i1,i2); Using where
 explain 
 select * from t0 where key1<3 or key2<3 or (key1>5 and key1<8) or 
 (key1>10 and key1<12) or (key2>100 and key2<110);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	17	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	17	Using sort_union(i1,i2); Using where
 explain select * from t0 where key2 = 45 or key1 <=> null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	range	i1,i2	i2	4	NULL	1	Using where
@@ -79,26 +79,26 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	range	i1,i2	i2	4	NULL	1	Using where
 explain select * from t0 where key2=10 or key3=3 or key4 <=> null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i2,i3,i4	i2,i3	4,4	NULL	2	Using where
+1	SIMPLE	t0	index_merge	i2,i3,i4	i2,i3	4,4	NULL	2	Using union(i2,i3); Using where
 explain select * from t0 where key2=10 or key3=3 or key4 is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i2,i3,i4	i2,i3	4,4	NULL	2	Using where
+1	SIMPLE	t0	index_merge	i2,i3,i4	i2,i3	4,4	NULL	2	Using union(i2,i3); Using where
 explain select key1 from t0 where (key1 <=> null) or (key2 < 5) or 
 (key3=10) or (key4 <=> null);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3,i4	i2,i3	4,4	NULL	6	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3,i4	i2,i3	4,4	NULL	6	Using sort_union(i2,i3); Using where
 explain select key1 from t0 where (key1 <=> null) or (key1 < 5) or 
 (key3=10) or (key4 <=> null);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i3,i4	i1,i3	4,4	NULL	5	Using where
+1	SIMPLE	t0	index_merge	i1,i3,i4	i1,i3	4,4	NULL	5	Using sort_union(i1,i3); Using where
 explain select * from t0 where 
 (key1 < 3 or key2 < 3) and (key3 < 4 or key4 < 4) and (key5 < 5 or key6 < 5);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3,i4,i5,i6	i1,i2	4,4	NULL	6	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3,i4,i5,i6	i1,i2	4,4	NULL	6	Using sort_union(i1,i2); Using where
 explain
 select * from t0 where (key1 < 3 or key2 < 6) and (key1 < 7 or key3 < 4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3	i1,i2	4,4	NULL	9	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3	i1,i2	4,4	NULL	9	Using sort_union(i1,i2); Using where
 select * from t0 where (key1 < 3 or key2 < 6) and (key1 < 7 or key3 < 4);
 key1	key2	key3	key4	key5	key6	key7	key8
 1	1	1	1	1	1	1	1023
@@ -109,7 +109,7 @@ key1	key2	key3	key4	key5	key6	key7	key8
 explain select * from t0 where 
 (key1 < 3 or key2 < 3) and (key3 < 4 or key4 < 4) and (key5 < 2 or key6 < 2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3,i4,i5,i6	i1,i2	4,4	NULL	6	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3,i4,i5,i6	i1,i2	4,4	NULL	6	Using sort_union(i1,i2); Using where
 explain select * from t0 where 
 (key1 < 3 or key2 < 3) and (key3 < 100);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -129,7 +129,7 @@ explain select * from t0 where
 or
 key1 < 7;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3	i1,i2	4,4	NULL	10	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3	i1,i2	4,4	NULL	10	Using sort_union(i1,i2); Using where
 select * from t0 where
 ((key1 < 4 or key2 < 4) and (key2 <5 or key3 < 4))
 or
@@ -146,25 +146,25 @@ explain select * from t0 where
 or 
 ((key5 < 5 or key6 < 6) and (key7 <7 or key8 < 4));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6,i7,i8	i1,i2,i5,i6	4,4,4,4	NULL	19	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6,i7,i8	i1,i2,i5,i6	4,4,4,4	NULL	19	Using sort_union(i1,i2,i5,i6); Using where
 explain select * from t0 where
 ((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
 or
 ((key7 <7 or key8 < 4) and (key5 < 5 or key6 < 6));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6,i7,i8	i3,i5,i7,i8	4,4,4,4	NULL	21	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6,i7,i8	i3,i5,i7,i8	4,4,4,4	NULL	21	Using sort_union(i3,i5,i7,i8); Using where
 explain select * from t0 where
 ((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
 or
 ((key3 <7 or key5 < 2) and (key5 < 5 or key6 < 6));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6	i3,i5	4,4	NULL	11	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6	i3,i5	4,4	NULL	11	Using sort_union(i3,i5); Using where
 explain select * from t0 where
 ((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
 or
 (((key3 <7 and key7 < 6) or key5 < 2) and (key5 < 5 or key6 < 6));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6,i7	i3,i5	4,4	NULL	11	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6,i7	i3,i5	4,4	NULL	11	Using sort_union(i3,i5); Using where
 explain select * from t0 where
 ((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
 or
@@ -176,7 +176,7 @@ explain select * from t0 force index(i1, i2, i3, i4, i5, i6 ) where
 or
 ((key3 >=5 or key5 < 2) and (key5 < 5 or key6 < 6));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6	i3,i5	0,4	NULL	1024	Using where
+1	SIMPLE	t0	index_merge	i1,i2,i3,i5,i6	i3,i5	0,4	NULL	1024	Using sort_union(i3,i5); Using where
 select * from t0 where key1 < 5 or key8 < 4 order by key1;
 key1	key2	key3	key4	key5	key6	key7	key8
 1	1	1	1	1	1	1	1023
@@ -190,7 +190,7 @@ key1	key2	key3	key4	key5	key6	key7	key8
 explain
 select * from t0 where key1 < 5 or key8 < 4 order by key1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i8	i1,i8	4,4	NULL	9	Using where; Using filesort
+1	SIMPLE	t0	index_merge	i1,i8	i1,i8	4,4	NULL	9	Using sort_union(i1,i8); Using where; Using filesort
 create table t2 like t0;
 insert into t2 select * from t0;
 alter table t2 add index i1_3(key1, key3);
@@ -200,7 +200,7 @@ alter table t2 drop index i2;
 alter table t2 add index i321(key3, key2, key1);
 explain select key3 from t2 where key1 = 100 or key2 = 100;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	index_merge	i1_3,i2_3	i1_3,i2_3	4,4	NULL	2	Using where
+1	SIMPLE	t2	index_merge	i1_3,i2_3	i1_3,i2_3	4,4	NULL	2	Using sort_union(i1_3,i2_3); Using where
 explain select key3 from t2 where key1 <100 or key2 < 100;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	i1_3,i2_3	i321	12	NULL	1024	Using where; Using index
@@ -226,7 +226,7 @@ key1a	key1b	key2	key2_1	key2_2	key3
 4	4	0	4	4	4
 explain select * from t4 where key1a = 3 or key1b = 4;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	index_merge	i1a,i1b	i1a,i1b	4,4	NULL	2	Using where
+1	SIMPLE	t4	index_merge	i1a,i1b	i1a,i1b	4,4	NULL	2	Using sort_union(i1a,i1b); Using where
 explain select * from t4 where key2 = 1 and (key2_1 = 1 or key3 = 5);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	ref	i2_1,i2_2	i2_1	4	const	10	Using where
@@ -241,7 +241,7 @@ insert into t1 select * from t0;
 explain select * from t0 left join t1 on (t0.key1=t1.key1) 
 where t0.key1=3 or t0.key2=4;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using union(i1,i2); Using where
 1	SIMPLE	t1	ref	i1	i1	4	test.t0.key1	1	
 select * from t0 left join t1 on (t0.key1=t1.key1)
 where t0.key1=3 or t0.key2=4;
@@ -251,13 +251,13 @@ key1	key2	key3	key4	key5	key6	key7	key8	key1	key2	key3	key4	key5	key6	key7	key8
 explain 
 select * from t0,t1 where (t0.key1=t1.key1) and ( t0.key1=3 or t0.key2=4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using union(i1,i2); Using where
 1	SIMPLE	t1	ref	i1	i1	4	test.t0.key1	1	
 explain 
 select * from t0,t1 where (t0.key1=t1.key1) and 
 (t0.key1=3 or t0.key2=4) and t1.key1<200;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using union(i1,i2); Using where
 1	SIMPLE	t1	ref	i1	i1	4	test.t0.key1	1	Using where
 explain 
 select * from t0,t1 where (t0.key1=t1.key1) and 
@@ -269,7 +269,7 @@ explain select * from t0,t1 where t0.key1 = 5 and
 (t1.key1 = t0.key1 or t1.key8 = t0.key1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	ref	i1	i1	4	const	1	Using where
-1	SIMPLE	t1	index_merge	i1,i8	i1,i8	4,4	NULL	2	Using where
+1	SIMPLE	t1	index_merge	i1,i8	i1,i8	4,4	NULL	2	Using union(i1,i8); Using where
 explain select * from t0,t1 where t0.key1 < 3 and
 (t1.key1 = t0.key1 or t1.key8 = t0.key1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@@ -278,13 +278,13 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain select * from t1 where key1=3 or key2=4 
 union select * from t1 where key1<4 or key3=5;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using where
-2	UNION	t1	index_merge	i1,i3	i1,i3	4,4	NULL	5	Using where
+1	PRIMARY	t1	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using union(i1,i2); Using where
+2	UNION	t1	index_merge	i1,i3	i1,i3	4,4	NULL	5	Using sort_union(i1,i3); Using where
 NULL	UNION RESULT	<union1,2>	ALL	NULL	NULL	NULL	NULL	NULL	
 explain select * from (select * from t1 where key1 = 3 or key2 =3) as Z where key8 >5;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	<derived2>	system	NULL	NULL	NULL	NULL	1	
-2	DERIVED	t1	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using where
+2	DERIVED	t1	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using union(i1,i2); Using where
 create table t3 like t0;
 insert into t3 select * from t0;
 alter table t3 add key9 int not null, add index i9(key9);
@@ -297,7 +297,7 @@ key1=1 or key2=2 or key3=3 or key4=4 or
 key5=5 or key6=6 or key7=7 or key8=8 or
 key9=9 or keyA=10 or keyB=11 or keyC=12;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t3	index_merge	i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC	i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC	4,4,4,4,4,4,4,4,4,4,4,4	NULL	12	Using where
+1	SIMPLE	t3	index_merge	i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC	i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC	4,4,4,4,4,4,4,4,4,4,4,4	NULL	12	Using union(i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC); Using where
 select * from t3 where
 key1=1 or key2=2 or key3=3 or key4=4 or
 key5=5 or key6=6 or key7=7 or key8=8 or
@@ -317,7 +317,7 @@ key1	key2	key3	key4	key5	key6	key7	key8	key9	keyA	keyB	keyC
 1016	1016	1016	1016	1016	1016	1016	8	1016	1016	1016	1016
 explain select * from t0 where key1 < 3 or key2 < 4;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	7	Using where
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	7	Using sort_union(i1,i2); Using where
 select * from t0 where key1 < 3 or key2 < 4;
 key1	key2	key3	key4	key5	key6	key7	key8
 1	1	1	1	1	1	1	1023

mysql-test/r/index_merge_innodb.result

@@ -8,7 +8,7 @@ INDEX i2(key2)
 ) engine=innodb;
 explain select * from t1 where key1 < 5 or key2 > 197;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	8	Using where
+1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	8	Using sort_union(i1,i2); Using where
 select * from t1 where key1 < 5 or key2 > 197;
 key1	key2
 0	200
@@ -18,7 +18,7 @@ key1	key2
 4	196
 explain select * from t1 where key1 < 3 or key2 > 195;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	8	Using where
+1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	8	Using sort_union(i1,i2); Using where
 select * from t1 where key1 < 3 or key2 > 195;
 key1	key2
 0	200
@@ -34,7 +34,7 @@ update t1 set str1='aaa', str2='bbb', str3=concat(key2, '-', key1 div 2, '_' ,if
 alter table t1 add primary key (str1, zeroval, str2, str3);
 explain select * from t1 where key1 < 5 or key2 > 197;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	8	Using where
+1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	8	Using sort_union(i1,i2); Using where
 select * from t1 where key1 < 5 or key2 > 197;
 key1	key2	str1	zeroval	str2	str3
 4	196	aaa	0	bbb	196-2_a
@@ -44,7 +44,7 @@ key1	key2	str1	zeroval	str2	str3
 0	200	aaa	0	bbb	200-0_a
 explain select * from t1 where key1 < 3 or key2 > 195;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	8	Using where
+1	SIMPLE	t1	index_merge	i1,i2	i1,i2	4,4	NULL	8	Using sort_union(i1,i2); Using where
 select * from t1 where key1 < 3 or key2 > 195;
 key1	key2	str1	zeroval	str2	str3
 4	196	aaa	0	bbb	196-2_a

mysql-test/r/index_merge_ror.result

+drop table if exists  t0,t1,t2;
+select count(*) from t1;
+count(*)
+64801
+explain select key1,key2 from t1 where key1=100 and key2=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2	key1,key2	5,5	NULL	3	Using intersect(key1,key2); Using where; Using index
+select key1,key2 from t1 where key1=100 and key2=100;
+key1	key2
+100	100
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3,key4	key1,key2,key3,key4	5,5,5,5	NULL	8	Using union(intersect(key1,key2),intersect(key3,key4)); Using where
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+key1	key2	key3	key4	filler1
+100	100	100	100	key1-key2-key3-key4
+insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, -1, -1, 'key1-key2');
+insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 100, 100, 'key4-key3');
+explain select key1,key2,filler1 from t1 where key1=100 and key2=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2	key1,key2	5,5	NULL	3	Using intersect(key1,key2); Using where
+select key1,key2,filler1 from t1 where key1=100 and key2=100;
+key1	key2	filler1
+100	100	key1-key2-key3-key4
+100	100	key1-key2
+explain select key1,key2 from t1 where key1=100 and key2=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2	key1,key2	5,5	NULL	3	Using intersect(key1,key2); Using where; Using index
+select key1,key2 from t1 where key1=100 and key2=100;
+key1	key2
+100	100
+100	100
+explain select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3,key4	key1,key2,key3,key4	5,5,5,5	NULL	8	Using union(intersect(key1,key2),intersect(key3,key4)); Using where
+select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+key1	key2	key3	key4
+100	100	100	100
+100	100	-1	-1
+-1	-1	100	100
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3,key4	key1,key2,key3,key4	5,5,5,5	NULL	8	Using union(intersect(key1,key2),intersect(key3,key4)); Using where
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+key1	key2	key3	key4	filler1
+100	100	100	100	key1-key2-key3-key4
+100	100	-1	-1	key1-key2
+-1	-1	100	100	key4-key3
+explain select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3	key1,key2,key3	5,5,5	NULL	1	Using intersect(key1,key2,key3); Using where; Using index
+select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
+key1	key2	key3
+100	100	100
+insert into t1 (key1,key2,key3,key4,filler1) values (101,101,101,101, 'key1234-101');
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3	key1,key2,key3	5,5,5	NULL	5	Using union(intersect(key1,key2),key3); Using where
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
+key1	key2	key3	key4	filler1
+100	100	100	100	key1-key2-key3-key4
+100	100	-1	-1	key1-key2
+101	101	101	101	key1234-101
+select key1,key2, filler1 from t1 where key1=100 and key2=100;
+key1	key2	filler1
+100	100	key1-key2-key3-key4
+100	100	key1-key2
+update t1 set filler1='to be deleted' where key1=100 and key2=100;
+update t1 set key1=200,key2=200 where key1=100 and key2=100;
+delete from t1 where key1=200 and key2=200;
+select key1,key2,filler1 from t1 where key2=100 and key2=200;
+key1	key2	filler1
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3,key4	key1,key2,key3,key4	5,5,5,5	NULL	8	Using union(intersect(key1,key2),intersect(key3,key4)); Using where
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+key1	key2	key3	key4	filler1
+-1	-1	100	100	key4-key3
+delete from t1 where key3=100 and key4=100;
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3,key4	key1,key2,key3,key4	5,5,5,5	NULL	8	Using union(intersect(key1,key2),intersect(key3,key4)); Using where
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+key1	key2	key3	key4	filler1
+explain select key1,key2 from t1 where key1=100 and key2=100;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2	key1,key2	5,5	NULL	3	Using intersect(key1,key2); Using where; Using index
+select key1,key2 from t1 where key1=100 and key2=100;
+key1	key2
+insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-1');
+insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-2');
+insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-3');
+explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3,key4	key3,key1,key2,key4	5,5,5,5	NULL	16	Using union(key3,intersect(key1,key2),key4); Using where
+select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+key1	key2	key3	key4	filler1
+100	100	200	200	key1-key2-key3-key4-3
+100	100	200	200	key1-key2-key3-key4-2
+100	100	200	200	key1-key2-key3-key4-1
+insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, -1, 200,'key4');
+explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3,key4	key3,key1,key2,key4	5,5,5,5	NULL	18	Using union(key3,intersect(key1,key2),key4); Using where
+select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+key1	key2	key3	key4	filler1
+100	100	200	200	key1-key2-key3-key4-3
+100	100	200	200	key1-key2-key3-key4-2
+100	100	200	200	key1-key2-key3-key4-1
+-1	-1	-1	200	key4
+insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 200, -1,'key3');
+explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2,key3,key4	key3,key1,key2,key4	5,5,5,5	NULL	20	Using union(key3,intersect(key1,key2),key4); Using where
+select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+key1	key2	key3	key4	filler1
+100	100	200	200	key1-key2-key3-key4-3
+100	100	200	200	key1-key2-key3-key4-2
+100	100	200	200	key1-key2-key3-key4-1
+-1	-1	-1	200	key4
+-1	-1	200	-1	key3
+explain select * from t1 where st_a=1 and st_b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b	st_a,st_b	4,4	NULL	2508	Using intersect(st_a,st_b); Using where
+explain select st_a,st_b from t1 where st_a=1 and st_b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b	st_a,st_b	4,4	NULL	2508	Using intersect(st_a,st_b); Using where; Using index
+explain select st_a from t1 ignore index (st_a) where st_a=1 and st_b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,stb_swt1a_2b,stb_swt1b,st_b	st_b	4	const	14720	Using where
+explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a	sta_swt12a	12	const,const,const	958	Using where
+explain select * from t1 where st_b=1 and swt1b=1 and swt2b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	stb_swt1a_2b,stb_swt1b,st_b	stb_swt1b	8	const,const	3757	Using where
+explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b	sta_swt12a,stb_swt1a_2b	12,12	NULL	42	Using intersect(sta_swt12a,stb_swt1a_2b); Using where
+explain select * from t1 ignore index (sta_swt21a, stb_swt1a_2b) 
+where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt12a,sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b	sta_swt12a,stb_swt1b	12,8	NULL	42	Using intersect(sta_swt12a,stb_swt1b); Using where
+explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b) 
+where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b	sta_swt1a,sta_swt2a,stb_swt1b	8,8,8	NULL	41	Using intersect(sta_swt1a,sta_swt2a,stb_swt1b); Using where
+explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b, stb_swt1b) 
+where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt1a,sta_swt2a,st_a,st_b	sta_swt1a,sta_swt2a,st_b	8,8,4	NULL	159	Using intersect(sta_swt1a,sta_swt2a,st_b); Using where
+explain select * from t1 
+where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b	sta_swt12a,stb_swt1a_2b	12,12	NULL	42	Using intersect(sta_swt12a,stb_swt1a_2b); Using where
+explain select * from t1 
+where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b	sta_swt1a,stb_swt1b	8,8	NULL	163	Using intersect(sta_swt1a,stb_swt1b); Using where
+explain select st_a from t1 
+where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b	sta_swt1a,stb_swt1b	8,8	NULL	163	Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
+explain select st_a from t1 
+where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b	sta_swt1a,stb_swt1b	8,8	NULL	163	Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
+drop table t0,t1;
+create table t2 (
+a char(10),
+b char(10),
+filler1 char(255),
+filler2 char(255),
+key(a(5)),
+key(b(5))
+);
+select count(a) from t2 where a='BBBBBBBB';
+count(a)
+4
+select count(a) from t2 where b='BBBBBBBB';
+count(a)
+4
+explain select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	a,b	a	6	const	4	Using where
+select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
+count(a)
+4
+select count(a) from t2 ignore index(a,b) where a='AAAAAAAA' and b='AAAAAAAA';
+count(a)
+4
+insert into t2 values ('ab', 'ab', 'uh', 'oh');
+explain select a from t2 where a='ab';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ref	a	a	6	const	1	Using where
+drop table t2;

mysql-test/r/index_merge_ror_cpk.result

+drop table if exists  t1;
+create table t1
+(
+pk1 int not null, 
+pk2 int not null,
+key1 int not null,
+key2 int not null,
+pktail1ok  int not null, 
+pktail2ok  int not null, 
+pktail3bad int not null,
+pktail4bad int not null,
+pktail5bad int not null,
+pk2copy int not null,
+badkey  int not null,
+filler1 char (200),
+filler2 char (200),
+key (key1),
+key (key2),
+/* keys with tails from CPK members */
+key (pktail1ok, pk1),
+key (pktail2ok, pk1, pk2),
+key (pktail3bad, pk2, pk1),
+key (pktail4bad, pk1, pk2copy),
+key (pktail5bad, pk1, pk2, pk2copy),
+primary key (pk1, pk2)
+) engine=innodb;
+explain select * from t1 where pk1 = 1 and pk2 < 80  and key1=0;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	PRIMARY,key1	PRIMARY	4	const	1	Using where
+select * from t1 where pk1 = 1 and pk2 < 80  and key1=0;
+pk1	pk2	key1	key2	pktail1ok	pktail2ok	pktail3bad	pktail4bad	pktail5bad	pk2copy	badkey	filler1	filler2
+1	10	0	0	0	0	0	0	0	10	0	filler-data-10	filler2
+1	11	0	0	0	0	0	0	0	11	0	filler-data-11	filler2
+1	12	0	0	0	0	0	0	0	12	0	filler-data-12	filler2
+1	13	0	0	0	0	0	0	0	13	0	filler-data-13	filler2
+1	14	0	0	0	0	0	0	0	14	0	filler-data-14	filler2
+1	15	0	0	0	0	0	0	0	15	0	filler-data-15	filler2
+1	16	0	0	0	0	0	0	0	16	0	filler-data-16	filler2
+1	17	0	0	0	0	0	0	0	17	0	filler-data-17	filler2
+1	18	0	0	0	0	0	0	0	18	0	filler-data-18	filler2
+1	19	0	0	0	0	0	0	0	19	0	filler-data-19	filler2
+explain select pk1,pk2 from t1 where key1 = 10 and key2=10 and 2*pk1+1 < 2*96+1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2	key1,key2	4,4	NULL	1	Using intersect(key1,key2); Using where; Using index
+select pk1,pk2 from t1 where key1 = 10 and key2=10 and 2*pk1+1 < 2*96+1;
+pk1	pk2
+95	50
+95	51
+95	52
+95	53
+95	54
+95	55
+95	56
+95	57
+95	58
+95	59
+explain select * from t1 where badkey=1 and key1=10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	key1	key1	4	const	101	Using where
+explain select * from t1 where pk1 < 7500 and key1 = 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	PRIMARY,key1	key1,PRIMARY	4,4	NULL	38	Using intersect(key1,PRIMARY); Using where
+explain select * from t1 where pktail1ok=1 and key1=10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,pktail1ok	key1,pktail1ok	4,4	NULL	1	Using intersect(key1,pktail1ok); Using where
+explain select * from t1 where pktail2ok=1 and key1=10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,pktail2ok	key1,pktail2ok	4,4	NULL	1	Using intersect(key1,pktail2ok); Using where
+select '  The following is actually a deficiency, it uses sort_union currently:' as 'note:';
+note:
+  The following is actually a deficiency, it uses sort_union currently:
+explain select * from t1 where (pktail2ok=1 and pk1< 50000) or key1=10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	PRIMARY,key1,pktail2ok	pktail2ok,key1	8,4	NULL	199	Using sort_union(pktail2ok,key1); Using where
+explain select * from t1 where pktail3bad=1 and key1=10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	key1,pktail3bad	pktail3bad	4	const	98	Using where
+explain select * from t1 where pktail4bad=1 and key1=10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	key1,pktail4bad	pktail4bad	4	const	99	Using where
+explain select * from t1 where pktail5bad=1 and key1=10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ref	key1,pktail5bad	pktail5bad	4	const	99	Using where
+explain select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2	key1,key2	4,4	NULL	1	Using intersect(key1,key2); Using where; Using index
+select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
+pk1	pk2	key1	key2
+95	50	10	10
+95	51	10	10
+95	52	10	10
+95	53	10	10
+95	54	10	10
+95	55	10	10
+95	56	10	10
+95	57	10	10
+95	58	10	10
+95	59	10	10
+drop table t1;

mysql-test/r/rowid_order_bdb.result

+drop table if exists t1, t2, t3,t4;
+create table t1 ( 
+pk1 int not NULL,
+key1 int(11),
+key2 int(11),
+PRIMARY KEY  (pk1),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=bdb;
+insert into t1 values (-5, 1, 1),
+(-100, 1, 1),
+(3, 1, 1),
+(0, 1, 1),
+(10, 1, 1);
+explain select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2	key1,key2	5,5	NULL	5	Using sort_union(key1,key2); Using where
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	key1	key2
+-100	1	1
+-5	1	1
+0	1	1
+3	1	1
+10	1	1
+drop table t1;
+create table t1 ( 
+pk1 int unsigned not NULL,
+key1 int(11),
+key2 int(11),
+PRIMARY KEY  (pk1),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=bdb;
+insert into t1 values (0, 1, 1),
+(0xFFFFFFFF, 1, 1),
+(0xFFFFFFFE, 1, 1),
+(1, 1, 1),
+(2, 1, 1);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	key1	key2
+0	1	1
+1	1	1
+2	1	1
+4294967294	1	1
+4294967295	1	1
+drop table t1;
+create table t1 ( 
+pk1 char(4) not NULL,
+key1 int(11),
+key2 int(11),
+PRIMARY KEY  (pk1),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=bdb collate latin2_general_ci;
+insert into t1 values ('a1', 1, 1),
+('b2', 1, 1),
+('A3', 1, 1),
+('B4', 1, 1);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	key1	key2
+a1	1	1
+A3	1	1
+b2	1	1
+B4	1	1
+drop table t1;
+create table t1 (
+pk1 int not NULL,
+pk2 char(4) not NULL collate latin1_german1_ci,
+pk3 char(4) not NULL collate latin1_bin,
+key1 int(11),
+key2 int(11),
+PRIMARY KEY  (pk1,pk2,pk3),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=bdb;
+insert into t1 values 
+(1, 'u', 'u',        1, 1),
+(1, 'u', char(0xEC), 1, 1),
+(1, 'u', 'x',        1, 1);
+insert ignore into t1 select pk1, char(0xEC), pk3, key1, key2  from t1;
+insert ignore into t1 select pk1, 'x', pk3, key1, key2  from t1 where pk2='u';
+insert ignore into t1 select 2, pk2, pk3, key1, key2  from t1;
+select * from t1;
+pk1	pk2	pk3	key1	key2
+1		u	1	1
+1		x	1	1
+1			1	1
+1	u	u	1	1
+1	u	x	1	1
+1	u		1	1
+1	x	u	1	1
+1	x	x	1	1
+1	x		1	1
+2		u	1	1
+2		x	1	1
+2			1	1
+2	u	u	1	1
+2	u	x	1	1
+2	u		1	1
+2	x	u	1	1
+2	x	x	1	1
+2	x		1	1
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	pk2	pk3	key1	key2
+1		u	1	1
+1		x	1	1
+1			1	1
+1	u	u	1	1
+1	u	x	1	1
+1	u		1	1
+1	x	u	1	1
+1	x	x	1	1
+1	x		1	1
+2		u	1	1
+2		x	1	1
+2			1	1
+2	u	u	1	1
+2	u	x	1	1
+2	u		1	1
+2	x	u	1	1
+2	x	x	1	1
+2	x		1	1
+alter table t1 drop primary key;
+select * from t1;
+pk1	pk2	pk3	key1	key2
+1		u	1	1
+1		x	1	1
+1			1	1
+1	u	u	1	1
+1	u	x	1	1
+1	u		1	1
+1	x	u	1	1
+1	x	x	1	1
+1	x		1	1
+2		u	1	1
+2		x	1	1
+2			1	1
+2	u	u	1	1
+2	u	x	1	1
+2	u		1	1
+2	x	u	1	1
+2	x	x	1	1
+2	x		1	1
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	pk2	pk3	key1	key2
+1		u	1	1
+1		x	1	1
+1			1	1
+1	u	u	1	1
+1	u	x	1	1
+1	u		1	1
+1	x	u	1	1
+1	x	x	1	1
+1	x		1	1
+2		u	1	1
+2		x	1	1
+2			1	1
+2	u	u	1	1
+2	u	x	1	1
+2	u		1	1
+2	x	u	1	1
+2	x	x	1	1
+2	x		1	1
+drop table t1;
+create table t1  (
+pk1 varchar(8) NOT NULL default '',
+pk2 varchar(4) NOT NULL default '',
+key1 int(11),
+key2 int(11),
+primary key(pk1, pk2),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=bdb;
+insert into t1 values ('','empt',2,2),
+('a','a--a',2,2),
+('bb','b--b',2,2),
+('ccc','c--c',2,2),
+('dddd','d--d',2,2);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	pk2	key1	key2
+	empt	2	2
+a	a--a	2	2
+bb	b--b	2	2
+ccc	c--c	2	2
+dddd	d--d	2	2
+drop table t1;

mysql-test/r/rowid_order_innodb.result

+drop table if exists t1, t2, t3,t4;
+create table t1 ( 
+pk1 int not NULL,
+key1 int(11),
+key2 int(11),
+PRIMARY KEY  (pk1),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=innodb;
+insert into t1 values (-5, 1, 1),
+(-100, 1, 1),
+(3, 1, 1),
+(0, 1, 1),
+(10, 1, 1);
+explain select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	key1,key2	key1,key2	5,5	NULL	6	Using sort_union(key1,key2); Using where
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	key1	key2
+-100	1	1
+-5	1	1
+0	1	1
+3	1	1
+10	1	1
+drop table t1;
+create table t1 ( 
+pk1 int unsigned not NULL,
+key1 int(11),
+key2 int(11),
+PRIMARY KEY  (pk1),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=innodb;
+insert into t1 values (0, 1, 1),
+(0xFFFFFFFF, 1, 1),
+(0xFFFFFFFE, 1, 1),
+(1, 1, 1),
+(2, 1, 1);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	key1	key2
+0	1	1
+1	1	1
+2	1	1
+4294967294	1	1
+4294967295	1	1
+drop table t1;
+create table t1 ( 
+pk1 char(4) not NULL,
+key1 int(11),
+key2 int(11),
+PRIMARY KEY  (pk1),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=innodb collate latin2_general_ci;
+insert into t1 values ('a1', 1, 1),
+('b2', 1, 1),
+('A3', 1, 1),
+('B4', 1, 1);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	key1	key2
+a1	1	1
+A3	1	1
+b2	1	1
+B4	1	1
+drop table t1;
+create table t1 (
+pk1 int not NULL,
+pk2 char(4) not NULL collate latin1_german1_ci,
+pk3 char(4) not NULL collate latin1_bin,
+key1 int(11),
+key2 int(11),
+PRIMARY KEY  (pk1,pk2,pk3),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=innodb;
+insert into t1 values 
+(1, 'u', 'u',        1, 1),
+(1, 'u', char(0xEC), 1, 1),
+(1, 'u', 'x',        1, 1);
+insert ignore into t1 select pk1, char(0xEC), pk3, key1, key2  from t1;
+insert ignore into t1 select pk1, 'x', pk3, key1, key2  from t1 where pk2='u';
+insert ignore into t1 select 2, pk2, pk3, key1, key2  from t1;
+select * from t1;
+pk1	pk2	pk3	key1	key2
+1		u	1	1
+1		x	1	1
+1			1	1
+1	u	u	1	1
+1	u	x	1	1
+1	u		1	1
+1	x	u	1	1
+1	x	x	1	1
+1	x		1	1
+2		u	1	1
+2		x	1	1
+2			1	1
+2	u	u	1	1
+2	u	x	1	1
+2	u		1	1
+2	x	u	1	1
+2	x	x	1	1
+2	x		1	1
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	pk2	pk3	key1	key2
+1		u	1	1
+1		x	1	1
+1			1	1
+1	u	u	1	1
+1	u	x	1	1
+1	u		1	1
+1	x	u	1	1
+1	x	x	1	1
+1	x		1	1
+2		u	1	1
+2		x	1	1
+2			1	1
+2	u	u	1	1
+2	u	x	1	1
+2	u		1	1
+2	x	u	1	1
+2	x	x	1	1
+2	x		1	1
+alter table t1 drop primary key;
+select * from t1;
+pk1	pk2	pk3	key1	key2
+1		u	1	1
+1		x	1	1
+1			1	1
+1	u	u	1	1
+1	u	x	1	1
+1	u		1	1
+1	x	u	1	1
+1	x	x	1	1
+1	x		1	1
+2		u	1	1
+2		x	1	1
+2			1	1
+2	u	u	1	1
+2	u	x	1	1
+2	u		1	1
+2	x	u	1	1
+2	x	x	1	1
+2	x		1	1
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	pk2	pk3	key1	key2
+1		u	1	1
+1		x	1	1
+1			1	1
+1	u	u	1	1
+1	u	x	1	1
+1	u		1	1
+1	x	u	1	1
+1	x	x	1	1
+1	x		1	1
+2		u	1	1
+2		x	1	1
+2			1	1
+2	u	u	1	1
+2	u	x	1	1
+2	u		1	1
+2	x	u	1	1
+2	x	x	1	1
+2	x		1	1
+drop table t1;
+create table t1  (
+pk1 varchar(8) NOT NULL default '',
+pk2 varchar(4) NOT NULL default '',
+key1 int(11),
+key2 int(11),
+primary key(pk1, pk2),
+KEY key1 (key1),
+KEY key2 (key2)
+) engine=innodb;
+insert into t1 values ('','empt',2,2),
+('a','a--a',2,2),
+('bb','b--b',2,2),
+('ccc','c--c',2,2),
+('dddd','d--d',2,2);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+pk1	pk2	key1	key2
+	empt	2	2
+a	a--a	2	2
+bb	b--b	2	2
+ccc	c--c	2	2
+dddd	d--d	2	2
+drop table t1;

mysql-test/t/index_merge_ror.test

+#
+#  ROR-index_merge tests. 
+#
+--disable_warnings
+drop table if exists  t0,t1,t2;
+--enable_warnings
+--disable_query_log
+create table t1
+(
+  /* Field names reflect value(rowid) distribution, st=STairs, swt= SaWTooth */
+  st_a int not null,
+  swt1a int not null,
+  swt2a int not null,
+
+  st_b int not null,
+  swt1b int not null,
+  swt2b int not null,
+
+  /* fields/keys for row retrieval tests */
+  key1 int,
+  key2 int,
+  key3 int,
+  key4 int,
+
+  /* make rows much bigger then keys */
+  filler1 char (200),
+  filler2 char (200),
+  filler3 char (200),
+  filler4 char (200),
+  filler5 char (200),
+  filler6 char (200),
+  
+  /* order of keys is important */
+  key sta_swt12a(st_a,swt1a,swt2a),
+  key sta_swt1a(st_a,swt1a),
+  key sta_swt2a(st_a,swt2a),
+  key sta_swt21a(st_a,swt2a,swt1a),
+
+  key st_a(st_a),
+  key stb_swt1a_2b(st_b,swt1b,swt2a),
+  key stb_swt1b(st_b,swt1b),
+  key st_b(st_b),
+
+  key(key1),
+  key(key2),
+  key(key3),
+  key(key4)
+) ;
+
+# Fill table 
+create table t0 as select * from t1;
+let $cnt=1000;
+while ($cnt)
+{
+  eval insert into t0 values (1, 2, 3, 1, 2, 3, 0, 0, 0, 0, 'data1', 'data2', 'data3', 'data4', 'data5', 'data6');
+  dec $cnt;
+}
+
+alter table t1 disable keys;
+let $1=4;
+while ($1)
+{
+  let $2=4;
+  while ($2) 
+  {
+    let $3=4;
+    while ($3)
+    {
+      eval insert into t1 select $1, $2, $3, $1 ,$2, $3, key1, key2, key3, key4, filler1, filler2, filler3, filler4, filler5, filler6 from t0;
+      dec $3;
+    }
+    dec $2;
+  }
+ dec $1;
+}
+
+# Row retrieval tests
+# -1 is used for values 'out of any range we are using'
+# insert enough rows for index intersection to be used for (key1,key2)
+insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 100, 100,'key1-key2-key3-key4');
+let $cnt=400;
+while ($cnt)
+{
+  eval insert into t1 (key1, key2, key3, key4, filler1) values (100, -1, 100, -1,'key1-key3');
+  dec $cnt;
+}
+let $cnt=400;
+while ($cnt)
+{
+  eval insert into t1 (key1, key2, key3, key4, filler1) values (-1, 100, -1, 100,'key2-key4');
+  dec $cnt;
+}
+alter table t1 enable keys;
+--enable_query_log
+select count(*) from t1;
+
+# One row results tests for cases where a single row matches all conditions 
+explain select key1,key2 from t1 where key1=100 and key2=100;
+select key1,key2 from t1 where key1=100 and key2=100;
+
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+
+# Several-rows results 
+insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, -1, -1, 'key1-key2');
+insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 100, 100, 'key4-key3');
+
+#  ROR-intersection, not covering
+explain select key1,key2,filler1 from t1 where key1=100 and key2=100;
+select key1,key2,filler1 from t1 where key1=100 and key2=100;
+
+#  ROR-intersection, covering
+explain select key1,key2 from t1 where key1=100 and key2=100;
+select key1,key2 from t1 where key1=100 and key2=100;
+
+#  ROR-union of ROR-intersections
+explain select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+
+#  3-way ROR-intersection
+explain select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
+select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
+
+#  ROR-union(ROR-intersection, ROR-range)
+insert into t1 (key1,key2,key3,key4,filler1) values (101,101,101,101, 'key1234-101');
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
+
+# Run some ROR updates/deletes
+select key1,key2, filler1 from t1 where key1=100 and key2=100;
+update t1 set filler1='to be deleted' where key1=100 and key2=100;
+update t1 set key1=200,key2=200 where key1=100 and key2=100;
+delete from t1 where key1=200 and key2=200;
+select key1,key2,filler1 from t1 where key2=100 and key2=200;
+
+# ROR-union(ROR-intersection) with one of ROR-intersection giving empty
+# results
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+
+delete from t1 where key3=100 and key4=100;
+
+# ROR-union with all ROR-intersections giving empty results
+explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
+
+# ROR-intersection with empty result
+explain select key1,key2 from t1 where key1=100 and key2=100;
+select key1,key2 from t1 where key1=100 and key2=100;
+
+# ROR-union tests with various cases.
+#  All scans returning duplicate rows: 
+insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-1');
+insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-2');
+insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-3');
+
+explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+
+insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, -1, 200,'key4');
+
+explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+
+insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 200, -1,'key3');
+
+explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
+
+##
+## Optimizer tests 
+##
+
+# Check that the shortest key is used for ROR-intersection, covering and non-covering.
+explain select * from t1 where st_a=1 and st_b=1;
+explain select st_a,st_b from t1 where st_a=1 and st_b=1;
+
+# Check if "ingore index" syntax works
+explain select st_a from t1 ignore index (st_a) where st_a=1 and st_b=1;
+
+# Do many tests 
+# Check that keys that don't improve selectivity are skipped.
+# 
+
+explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1;
+
+explain select * from t1 where st_b=1 and swt1b=1 and swt2b=1;
+
+explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
+
+explain select * from t1 ignore index (sta_swt21a, stb_swt1a_2b) 
+  where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
+
+explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b) 
+  where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
+
+explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b, stb_swt1b) 
+  where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
+
+explain select * from t1 
+  where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1;
+
+explain select * from t1 
+  where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
+
+explain select st_a from t1 
+  where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
+
+explain select st_a from t1 
+  where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
+
+drop table t0,t1;
+
+# 'Partially' covered fields test
+
+create table t2 (
+  a char(10),
+  b char(10),
+  filler1 char(255),
+  filler2 char(255),
+  key(a(5)),
+  key(b(5))
+);
+
+--disable_query_log
+let $1=8;
+while ($1)
+{
+  eval insert into t2 values (repeat(char($1+64), 8),repeat(char($1+64), 8),'filler1', 'filler2');
+  dec $1;
+}
+insert into t2 select * from t2;
+insert into t2 select * from t2;
+--enable_query_log
+
+# The table row buffer is reused. Fill it with rows that don't match.
+select count(a) from t2 where a='BBBBBBBB';
+select count(a) from t2 where b='BBBBBBBB';
+
+# BUG#1: 
+explain select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
+select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
+select count(a) from t2 ignore index(a,b) where a='AAAAAAAA' and b='AAAAAAAA';
+
+insert into t2 values ('ab', 'ab', 'uh', 'oh');
+explain select a from t2 where a='ab';
+drop table t2;

mysql-test/t/index_merge_ror_cpk.test

+#
+# Clustered PK ROR-index_merge tests
+#
+-- source include/have_innodb.inc
+
+--disable_warnings
+drop table if exists  t1;
+--enable_warnings
+
+create table t1
+(
+  pk1 int not null, 
+  pk2 int not null,
+ 
+  key1 int not null,
+  key2 int not null,
+
+  pktail1ok  int not null, 
+  pktail2ok  int not null, 
+  pktail3bad int not null,
+  pktail4bad int not null,
+  pktail5bad int not null,
+
+  pk2copy int not null,
+  badkey  int not null,
+
+  filler1 char (200),
+  filler2 char (200),
+  key (key1),
+  key (key2),
+
+  /* keys with tails from CPK members */
+  key (pktail1ok, pk1),
+  key (pktail2ok, pk1, pk2),
+  key (pktail3bad, pk2, pk1),
+  key (pktail4bad, pk1, pk2copy),
+  key (pktail5bad, pk1, pk2, pk2copy),
+
+  primary key (pk1, pk2)
+) engine=innodb;
+
+--disable_query_log
+set autocommit=0;
+let $1=10000;
+while ($1)
+{
+  eval insert into t1 values ($1 div 10,$1 mod 100,   $1/100,$1/100,   $1/100,$1/100,$1/100,$1/100,$1/100, $1 mod 100, $1/1000,'filler-data-$1','filler2');
+  dec $1;
+}
+set autocommit=1;
+--enable_query_log
+
+# Verify that range scan on CPK is ROR 
+# (use index_intersection because it is impossible to check that for index union) 
+explain select * from t1 where pk1 = 1 and pk2 < 80  and key1=0;
+# CPK scan + 1 ROR range scan is a special case
+select * from t1 where pk1 = 1 and pk2 < 80  and key1=0;
+
+# Verify that CPK fields are considered to be covered by index scans 
+explain select pk1,pk2 from t1 where key1 = 10 and key2=10 and 2*pk1+1 < 2*96+1;
+select pk1,pk2 from t1 where key1 = 10 and key2=10 and 2*pk1+1 < 2*96+1;
+
+# Verify that CPK is always used for index intersection scans
+# (this is because it is used as a filter, not for retrieval)
+explain select * from t1 where badkey=1 and key1=10;
+explain select * from t1 where pk1 < 7500 and key1 = 10;
+  
+# Verify that keys with 'tails' of PK members are ok.
+explain select * from t1 where pktail1ok=1 and key1=10;
+explain select * from t1 where pktail2ok=1 and key1=10;
+
+select '  The following is actually a deficiency, it uses sort_union currently:' as 'note:';
+explain select * from t1 where (pktail2ok=1 and pk1< 50000) or key1=10;
+
+explain select * from t1 where pktail3bad=1 and key1=10;
+explain select * from t1 where pktail4bad=1 and key1=10;
+explain select * from t1 where pktail5bad=1 and key1=10;
+
+# Test for problem with innodb key values prefetch buffer: 
+explain select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
+select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
+
+drop table t1;
+

mysql-test/t/rowid_order_bdb.test

+#
+# Test for rowid ordering (and comparison) functions.
+# do index_merge select for tables with PK of various types. 
+#
+--disable_warnings
+drop table if exists t1, t2, t3,t4;
+--enable_warnings
+
+-- source include/have_bdb.inc
+
+# Signed number as rowid 
+create table t1 ( 
+  pk1 int not NULL,
+  key1 int(11),
+  key2 int(11),
+  PRIMARY KEY  (pk1),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=bdb; 
+insert into t1 values (-5, 1, 1),
+  (-100, 1, 1),
+  (3, 1, 1),
+  (0, 1, 1),
+  (10, 1, 1);
+explain select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+drop table t1;
+
+# Unsigned numbers as rowids 
+create table t1 ( 
+  pk1 int unsigned not NULL,
+  key1 int(11),
+  key2 int(11),
+  PRIMARY KEY  (pk1),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=bdb; 
+insert into t1 values (0, 1, 1),
+  (0xFFFFFFFF, 1, 1),
+  (0xFFFFFFFE, 1, 1),
+  (1, 1, 1),
+  (2, 1, 1);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+drop table t1;
+
+# Case-insensitive char(N)
+create table t1 ( 
+  pk1 char(4) not NULL,
+  key1 int(11),
+  key2 int(11),
+  PRIMARY KEY  (pk1),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=bdb collate latin2_general_ci;
+insert into t1 values ('a1', 1, 1),
+  ('b2', 1, 1),
+  ('A3', 1, 1),
+  ('B4', 1, 1);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+drop table t1;
+
+# Multi-part PK
+create table t1 (
+  pk1 int not NULL,
+  pk2 char(4) not NULL collate latin1_german1_ci,
+  pk3 char(4) not NULL collate latin1_bin,
+  key1 int(11),
+  key2 int(11),
+  PRIMARY KEY  (pk1,pk2,pk3),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=bdb;
+insert into t1 values 
+  (1, 'u', 'u',        1, 1),
+  (1, 'u', char(0xEC), 1, 1),
+  (1, 'u', 'x',        1, 1);
+insert ignore into t1 select pk1, char(0xEC), pk3, key1, key2  from t1;
+insert ignore into t1 select pk1, 'x', pk3, key1, key2  from t1 where pk2='u';
+insert ignore into t1 select 2, pk2, pk3, key1, key2  from t1;
+select * from t1;
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+
+# Hidden PK
+alter table t1 drop primary key;
+select * from t1;
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+drop table t1;
+
+# Variable-length PK
+# this is also test for Bug#2688
+create table t1  (
+  pk1 varchar(8) NOT NULL default '',
+  pk2 varchar(4) NOT NULL default '',
+  key1 int(11),
+  key2 int(11),
+  primary key(pk1, pk2),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=bdb;
+insert into t1 values ('','empt',2,2),
+  ('a','a--a',2,2),
+  ('bb','b--b',2,2),
+  ('ccc','c--c',2,2),
+  ('dddd','d--d',2,2);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+
+drop table t1;
+

mysql-test/t/rowid_order_innodb.test

+#
+# Test for rowid ordering (and comparison) functions.
+# do index_merge select for tables with PK of various types. 
+#
+--disable_warnings
+drop table if exists t1, t2, t3,t4;
+--enable_warnings
+
+-- source include/have_innodb.inc
+
+# Signed number as rowid 
+create table t1 ( 
+  pk1 int not NULL,
+  key1 int(11),
+  key2 int(11),
+  PRIMARY KEY  (pk1),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=innodb; 
+insert into t1 values (-5, 1, 1),
+  (-100, 1, 1),
+  (3, 1, 1),
+  (0, 1, 1),
+  (10, 1, 1);
+explain select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+drop table t1;
+
+# Unsigned numbers as rowids 
+create table t1 ( 
+  pk1 int unsigned not NULL,
+  key1 int(11),
+  key2 int(11),
+  PRIMARY KEY  (pk1),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=innodb; 
+insert into t1 values (0, 1, 1),
+  (0xFFFFFFFF, 1, 1),
+  (0xFFFFFFFE, 1, 1),
+  (1, 1, 1),
+  (2, 1, 1);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+drop table t1;
+
+# Case-insensitive char(N)
+create table t1 ( 
+  pk1 char(4) not NULL,
+  key1 int(11),
+  key2 int(11),
+  PRIMARY KEY  (pk1),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=innodb collate latin2_general_ci;
+insert into t1 values ('a1', 1, 1),
+  ('b2', 1, 1),
+  ('A3', 1, 1),
+  ('B4', 1, 1);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+drop table t1;
+
+# Multi-part PK
+create table t1 (
+  pk1 int not NULL,
+  pk2 char(4) not NULL collate latin1_german1_ci,
+  pk3 char(4) not NULL collate latin1_bin,
+  key1 int(11),
+  key2 int(11),
+  PRIMARY KEY  (pk1,pk2,pk3),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=innodb;
+insert into t1 values 
+  (1, 'u', 'u',        1, 1),
+  (1, 'u', char(0xEC), 1, 1),
+  (1, 'u', 'x',        1, 1);
+insert ignore into t1 select pk1, char(0xEC), pk3, key1, key2  from t1;
+insert ignore into t1 select pk1, 'x', pk3, key1, key2  from t1 where pk2='u';
+insert ignore into t1 select 2, pk2, pk3, key1, key2  from t1;
+select * from t1;
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+
+# Hidden PK
+alter table t1 drop primary key;
+select * from t1;
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+drop table t1;
+
+# Variable-length PK
+# this is also test for Bug#2688
+create table t1  (
+  pk1 varchar(8) NOT NULL default '',
+  pk2 varchar(4) NOT NULL default '',
+  key1 int(11),
+  key2 int(11),
+  primary key(pk1, pk2),
+  KEY key1 (key1),
+  KEY key2 (key2)
+) engine=innodb;
+insert into t1 values ('','empt',2,2),
+  ('a','a--a',2,2),
+  ('bb','b--b',2,2),
+  ('ccc','c--c',2,2),
+  ('dddd','d--d',2,2);
+select * from t1 force index(key1, key2) where key1 < 3 or key2 < 3;
+
+drop table t1;
+

mysys/my_bit.c

@@ -71,3 +71,8 @@ uint my_count_bits(ulonglong v)
 #endif
 }
 
+uint my_count_bits_ushort(ushort v)
+{
+  return nbits[v];
+}
+

mysys/my_bitmap.c

@@ -29,6 +29,9 @@
     * bitmap_intersect() is an exception :)
       (for for Bitmap::intersect(ulonglong map2buff))
   
+  If THREAD is defined all bitmap operations except bitmap_init/bitmap_free 
+  are thread-safe.
+
   TODO:
   Make assembler THREAD safe versions of these using test-and-set instructions
 */
@@ -330,3 +333,66 @@ void bitmap_union(MY_BITMAP *map, const MY_BITMAP *map2)
   bitmap_unlock(map);
 }
 
+
+/*
+  SYNOPSIS
+    bitmap_bits_set()
+      map
+  RETURN
+    Number of set bits in the bitmap.
+*/
+
+uint bitmap_bits_set(const MY_BITMAP *map)
+{  
+  uchar *m= map->bitmap;
+  uchar *end= m + map->bitmap_size;
+  uint res= 0;
+
+  DBUG_ASSERT(map->bitmap);
+  bitmap_lock((MY_BITMAP *)map);
+  while (m < end)
+  {
+    res+= my_count_bits_ushort(*m++);
+  }
+  bitmap_unlock((MY_BITMAP *)map);
+  return res;
+}
+
+
+/* 
+  SYNOPSIS
+    bitmap_get_first()
+      map
+  RETURN 
+    Number of first unset bit in the bitmap or MY_BIT_NONE if all bits are set.
+*/
+
+uint bitmap_get_first(const MY_BITMAP *map)
+{
+  uchar *bitmap=map->bitmap;
+  uint bit_found = MY_BIT_NONE;
+  uint bitmap_size=map->bitmap_size*8;
+  uint i;
+
+  DBUG_ASSERT(map->bitmap);
+  bitmap_lock((MY_BITMAP *)map);
+  for (i=0; i < bitmap_size ; i++, bitmap++)
+  {
+    if (*bitmap != 0xff)
+    {						/* Found slot with free bit */
+      uint b;
+      for (b=0; ; b++)
+      {
+	if (!(*bitmap & (1 << b)))
+	{
+	  bit_found = (i*8)+b;
+	  break;
+	}
+      }
+      break;					/* Found bit */
+    }
+  }
+  bitmap_unlock((MY_BITMAP *)map);
+  return bit_found;
+}
+

sql/ha_berkeley.cc

@@ -2499,4 +2499,29 @@ ha_rows ha_berkeley::estimate_number_of_rows()
   return share->rows + HA_BERKELEY_EXTRA_ROWS;
 }
 
+int ha_berkeley::cmp_ref(const byte *ref1, const byte *ref2)
+{
+  if (hidden_primary_key)
+    return memcmp(ref1, ref2, BDB_HIDDEN_PRIMARY_KEY_LENGTH);
+
+  int result;
+  Field *field;
+  KEY *key_info=table->key_info+table->primary_key;
+  KEY_PART_INFO *key_part=key_info->key_part;
+  KEY_PART_INFO *end=key_part+key_info->key_parts;
+
+  for (; key_part != end; key_part++)
+  {
+    field=  key_part->field; 
+    result= field->pack_cmp((const char*)ref1, (const char*)ref2, 
+                            key_part->length);
+    if (result)
+      return result;
+    ref1 += field->packed_col_length((const char*)ref1, key_part->length);
+    ref2 += field->packed_col_length((const char*)ref2, key_part->length);
+  }
+
+  return 0;
+}
+
 #endif /* HAVE_BERKELEY_DB */

sql/ha_berkeley.h

@@ -163,6 +163,7 @@ class ha_berkeley: public handler
   void print_error(int error, myf errflag);
   uint8 table_cache_type() { return HA_CACHE_TBL_TRANSACT; }
   bool primary_key_is_clustered() { return true; }
+  int cmp_ref(const byte *ref1, const byte *ref2);
 };
 
 extern bool berkeley_shared_data;

sql/ha_heap.h

@@ -94,5 +94,10 @@ class ha_heap: public handler
 
   THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
 			     enum thr_lock_type lock_type);
-
+  int cmp_ref(const byte *ref1, const byte *ref2)
+  {
+    HEAP_PTR ptr1=*(HEAP_PTR*)ref1;
+    HEAP_PTR ptr2=*(HEAP_PTR*)ref2;
+    return ptr1 < ptr2? -1 : (ptr1 > ptr2? 1 : 0);
+  }
 };

sql/ha_innodb.cc

@@ -749,6 +749,8 @@ ha_innobase::init_table_handle_for_HANDLER(void)
         prebuilt->read_just_key = FALSE;
 
 	prebuilt->used_in_HANDLER = TRUE;
+
+	prebuilt->keep_other_fields_on_keyread = FALSE;
 }
 
 /*************************************************************************
@@ -4579,9 +4581,11 @@ ha_innobase::extra(
                         if (prebuilt->blob_heap) {
                                 row_mysql_prebuilt_free_blob_heap(prebuilt);
                         }
+                        prebuilt->keep_other_fields_on_keyread = 0;
                         prebuilt->read_just_key = 0;
                         break;
   		case HA_EXTRA_RESET_STATE:
+	        	prebuilt->keep_other_fields_on_keyread = 0;
 	        	prebuilt->read_just_key = 0;
     	        	break;
 		case HA_EXTRA_NO_KEYREAD:
@@ -4600,6 +4604,9 @@ ha_innobase::extra(
 	        case HA_EXTRA_KEYREAD:
 	        	prebuilt->read_just_key = 1;
 	        	break;
+		case HA_EXTRA_KEYREAD_PRESERVE_FIELDS:
+			prebuilt->keep_other_fields_on_keyread = 1;
+			break;
 		default:/* Do nothing */
 			;
 	}
@@ -4648,6 +4655,7 @@ ha_innobase::start_stmt(
 	prebuilt->sql_stat_start = TRUE;
 	prebuilt->hint_need_to_fetch_extra_cols = 0;
 	prebuilt->read_just_key = 0;
+        prebuilt->keep_other_fields_on_keyread = FALSE;
 
 	if (!prebuilt->mysql_has_locked) {
 	        /* This handle is for a temporary table created inside
@@ -4725,6 +4733,7 @@ ha_innobase::external_lock(
 	prebuilt->hint_need_to_fetch_extra_cols = 0;
 
 	prebuilt->read_just_key = 0;
+	prebuilt->keep_other_fields_on_keyread = FALSE;
 
 	if (lock_type == F_WRLCK) {
 
@@ -5161,4 +5170,52 @@ ha_innobase::get_auto_increment()
 	return(nr);
 }
 
+int
+ha_innobase::cmp_ref(
+	const mysql_byte *ref1,
+	const mysql_byte *ref2)
+{
+	row_prebuilt_t*	 prebuilt = (row_prebuilt_t*) innobase_prebuilt;
+	enum_field_types mysql_type;
+	Field*		 field;
+	int result;
+
+	if (prebuilt->clust_index_was_generated)
+		return memcmp(ref1, ref2, DATA_ROW_ID_LEN);
+
+	/* Do type-aware comparison of Primary Key members. PK members
+	are always NOT NULL, so no checks for NULL are performed */
+	KEY_PART_INFO *key_part= table->key_info[table->primary_key].key_part;
+	KEY_PART_INFO *key_part_end= 
+	  key_part + table->key_info[table->primary_key].key_parts;
+	for (; key_part != key_part_end; ++key_part) {
+		field = key_part->field;
+		mysql_type = field->type();
+		if (mysql_type == FIELD_TYPE_TINY_BLOB
+		    || mysql_type == FIELD_TYPE_MEDIUM_BLOB
+		    || mysql_type == FIELD_TYPE_BLOB
+		    || mysql_type == FIELD_TYPE_LONG_BLOB) {
+		    
+			ut_a(!ref1[1]);
+			ut_a(!ref2[1]);
+			byte len1= *ref1;
+			byte len2= *ref2;
+			ref1 += 2;
+			ref2 += 2;
+			result =
+			  ((Field_blob*)field)->cmp((const char*)ref1, len1,
+			                            (const char*)ref2, len2);
+		} else {
+			result = 
+			  field->cmp((const char*)ref1, (const char*)ref2);
+		}
+
+		if (result)
+			return result;
+		ref1 += key_part->length;
+		ref2 += key_part->length;
+	}
+	return 0;
+}
+
 #endif /* HAVE_INNOBASE_DB */

sql/ha_innodb.h

@@ -184,6 +184,7 @@ class ha_innobase: public handler
 	longlong get_auto_increment();
         uint8 table_cache_type() { return HA_CACHE_TBL_ASKTRANSACT; }
         bool primary_key_is_clustered() { return true; }
+        int cmp_ref(const byte *ref1, const byte *ref2);
 };
 
 extern uint innobase_init_flags, innobase_lock_type;

sql/handler.h

@@ -446,6 +446,11 @@ public:
      false otherwise
   */
   virtual bool primary_key_is_clustered() { return false; }
+
+  virtual int cmp_ref(const byte *ref1, const byte *ref2)
+  {
+    return memcmp(ref1, ref2, ref_length);
+  }
 };
 
 	/* Some extern variables used with handlers */

sql/opt_range.h

@@ -78,25 +78,59 @@ public:
   ha_rows records;  /* estimate of # of records to be retrieved */
   double  read_time; /* time to perform this retrieval          */
   TABLE   *head;
-
   /*
-    the only index this quick select uses, or MAX_KEY for 
-    QUICK_INDEX_MERGE_SELECT
+    Index this quick select uses, or MAX_KEY for quick selects 
+    that use several indexes
   */
   uint index;
-  uint max_used_key_length, used_key_parts;
+
+  /*
+    Total length of first used_key_parts parts of the key.
+    Applicable if index!= MAX_KEY.
+  */
+  uint max_used_key_length;
+
+  /*
+    Max. number of (first) key parts this quick select uses for retrieval.
+    eg. for "(key1p1=c1 AND key1p2=c2) OR key1p1=c2" used_key_parts == 2.
+    Applicable if index!= MAX_KEY.
+  */
+  uint used_key_parts;
 
   QUICK_SELECT_I();
   virtual ~QUICK_SELECT_I(){};
+  
   /*
-    Call init() immediately after creation of quick select. if init() call 
-    fails, reset() or get_next() must not be called.
+    Do post-constructor initialization.
+    SYNOPSIS
+      init()
+    
+    init() performs initializations that should have been in constructor if 
+    it was possible to return errors from constructors. The join optimizer may 
+    create and then delete quick selects without retrieving any rows so init()
+    must not contain any IO or CPU intensive code.
+
+    If init() call fails the only valid action is to delete this quick select, 
+    reset() and get_next() must not be called.
+    
+    RETURN
+      0      OK
+      other  Error code
   */
   virtual int  init() = 0;
   
   /* 
-    Call reset() before first get_next call. get_next must not be called if 
-    reset() call fails.
+    Initialize quick select for row retrieval.
+    SYNOPSIS
+      reset()
+    
+    reset() should be called when it is certain that row retrieval will be 
+    necessary. This call may do heavyweight initialization like buffering first
+    N records etc. If reset() call fails get_next() must not be called.
+    
+    RETURN
+      0      OK
+      other  Error code
   */
   virtual int  reset(void) = 0;
   virtual int  get_next() = 0;   /* get next record to retrieve */
@@ -107,27 +141,98 @@ public:
     QS_TYPE_RANGE = 0,
     QS_TYPE_INDEX_MERGE = 1,
     QS_TYPE_RANGE_DESC = 2,
-    QS_TYPE_FULLTEXT   = 3
+    QS_TYPE_FULLTEXT   = 3,
+    QS_TYPE_ROR_INTERSECT = 4,
+    QS_TYPE_ROR_UNION = 5,
   };
 
-  /* Get type of this quick select - one of the QS_* values */
+  /* Get type of this quick select - one of the QS_TYPE_* values */
   virtual int get_type() = 0;
+
+  /*
+    Initialize this quick select as a merged scan inside a ROR-union or a ROR-
+    intersection scan. The caller must not additionally call init() if this 
+    function is called.
+    SYNOPSIS
+      init_ror_merged_scan()
+        reuse_handler If true, the quick select may use table->handler, otherwise
+                      it must create and use a separate handler object.
+    RETURN
+      0     Ok
+      other Error 
+  */
+  virtual int init_ror_merged_scan(bool reuse_handler)
+  { DBUG_ASSERT(0); return 1; }
+  
+  /*
+    Save ROWID of last retrieved row in file->ref. This used in ROR-merging.
+  */
+  virtual void save_last_pos(){};
+
+  /* 
+    Append comma-separated list of keys this quick select uses to key_names;
+    append comma-separated list of corresponding used lengths to used_lengths.
+    This is used by select_describe.
+  */
+  virtual void add_keys_and_lengths(String *key_names, 
+                                    String *used_lengths)=0;
+ 
+  /* 
+    Append text representation of quick select structure (what and how is 
+    merged) to str. The result is added to "Extra" field in EXPLAIN output.
+    This function is implemented only by quick selects that merge other quick
+    selects output and/or can produce output suitable for merging.
+  */
+  virtual void add_info_string(String *str) {};
+  /*
+    Return 1 if any index used by this quick select 
+     a) uses field that is listed in passed field list or 
+     b) is automatically updated (like a timestamp)
+  */
+  virtual bool check_if_keys_used(List<Item> *fields);
+
+  /*
+    rowid of last row retrieved by this quick select. This is used only when 
+    doing ROR-index_merge selects 
+  */
+  byte    *last_rowid;
+
+  /*
+    Table record buffer used by this quick select. 
+  */
+  byte    *record;
+#ifndef DBUG_OFF
+  /*
+    Print quick select information to DBUG_FILE. Caller is responsible 
+    for locking DBUG_FILE before this call and unlocking it afterwards.
+  */
+  virtual void dbug_dump(int indent, bool verbose)= 0;
+#endif 
 };
 
+
 struct st_qsel_param;
 class SEL_ARG;
 
+/*
+  Quick select that does a range scan on a single key. The records are 
+  returned in key order.
+*/
 class QUICK_RANGE_SELECT : public QUICK_SELECT_I
 {
 protected:
   bool next,dont_free;
 public:
   int error;
+protected:
   handler *file;
-  byte    *record;
+  /*
+    If true, this quick select has its "own" handler object which should be
+    closed no later then this quick select is deleted.
+  */
+  bool free_file;
+
 protected:
-  friend void print_quick_sel_range(QUICK_RANGE_SELECT *quick,
-                                    const key_map* needed_reg);
   friend
   QUICK_RANGE_SELECT *get_quick_select_for_ref(THD *thd, TABLE *table, 
                                                struct st_table_ref *ref);
@@ -141,18 +246,20 @@ protected:
                                               MEM_ROOT *alloc);
   friend class QUICK_SELECT_DESC;
   friend class QUICK_INDEX_MERGE_SELECT;
+  friend class QUICK_ROR_INTERSECT_SELECT;
 
   DYNAMIC_ARRAY ranges;     /* ordered array of range ptrs */
   QUICK_RANGE **cur_range;  /* current element in ranges  */
 
   QUICK_RANGE *range;
-  MEM_ROOT alloc;
   KEY_PART *key_parts;  
   KEY_PART_INFO *key_part_info;
   int cmp_next(QUICK_RANGE *range);
   int cmp_prev(QUICK_RANGE *range);
   bool row_in_ranges();
 public:
+  MEM_ROOT alloc;
+
   QUICK_RANGE_SELECT(THD *thd, TABLE *table,uint index_arg,bool no_alloc=0,
                      MEM_ROOT *parent_alloc=NULL);
   ~QUICK_RANGE_SELECT();
@@ -168,7 +275,17 @@ public:
   int get_next();
   bool reverse_sorted() { return 0; }
   bool unique_key_range();
+  int init_ror_merged_scan(bool reuse_handler);
+  void save_last_pos()
+  {
+    file->position(record);
+  };
   int get_type() { return QS_TYPE_RANGE; }
+  void add_keys_and_lengths(String *key_names, String *used_lengths);
+  void add_info_string(String *str);
+#ifndef DBUG_OFF
+  void dbug_dump(int indent, bool verbose);
+#endif
 };
 
 
@@ -254,6 +371,12 @@ public:
   bool reverse_sorted() { return false; }
   bool unique_key_range() { return false; }
   int get_type() { return QS_TYPE_INDEX_MERGE; }
+  void add_keys_and_lengths(String *key_names, String *used_lengths);
+  void add_info_string(String *str);
+  bool check_if_keys_used(List<Item> *fields);
+#ifndef DBUG_OFF
+  void dbug_dump(int indent, bool verbose);
+#endif
 
   bool push_quick_back(QUICK_RANGE_SELECT *quick_sel_range);
 
@@ -264,9 +387,6 @@ public:
   List_iterator_fast<QUICK_RANGE_SELECT> cur_quick_it;
   QUICK_RANGE_SELECT* cur_quick_select;
   
-  /* last element in quick_selects list */
-  QUICK_RANGE_SELECT* last_quick_select;
-
   /* quick select that uses clustered primary key (NULL if none) */
   QUICK_RANGE_SELECT* pk_quick_select;
   
@@ -278,12 +398,120 @@ public:
 
   THD *thd;
   int prepare_unique();
-  bool reset_called;
   
   /* used to get rows collected in Unique */
   READ_RECORD read_record;
 };
 
+
+/*
+  Rowid-Ordered Retrieval (ROR) index intersection quick select.
+  This quick select produces intersection of row sequences returned 
+  by several QUICK_RANGE_SELECTs it "merges".
+  
+  All merged QUICK_RANGE_SELECTs must return rowids in rowid order. 
+  QUICK_ROR_INTERSECT_SELECT will return rows in rowid order, too.
+
+  All merged quick selects retrieve {rowid, covered_fields} tuples (not full 
+  table records).
+  QUICK_ROR_INTERSECT_SELECT retrieves full records if it is not being used 
+  by QUICK_ROR_INTERSECT_SELECT and all merged quick selects together don't 
+  cover needed all fields.
+  
+  If one of the merged quick selects is a Clustered PK range scan, it is
+  used only to filter rowid sequence produced by other merged quick selects.
+*/
+
+class QUICK_ROR_INTERSECT_SELECT : public QUICK_SELECT_I 
+{
+public:
+  QUICK_ROR_INTERSECT_SELECT(THD *thd, TABLE *table, 
+                             bool retrieve_full_rows,
+                             MEM_ROOT *parent_alloc);
+  ~QUICK_ROR_INTERSECT_SELECT();
+
+  int  init();
+  int  reset(void);
+  int  get_next();
+  bool reverse_sorted() { return false; }
+  bool unique_key_range() { return false; }
+  int get_type() { return QS_TYPE_ROR_INTERSECT; }
+  void add_keys_and_lengths(String *key_names, String *used_lengths);
+  void add_info_string(String *str);
+  bool check_if_keys_used(List<Item> *fields);
+#ifndef DBUG_OFF
+  void dbug_dump(int indent, bool verbose);
+#endif
+  int init_ror_merged_scan(bool reuse_handler);
+  bool push_quick_back(QUICK_RANGE_SELECT *quick_sel_range);
+
+  /* 
+    Range quick selects this intersection consists of, not including
+    cpk_quick.
+  */
+  List<QUICK_RANGE_SELECT> quick_selects;
+  
+  /* 
+    Merged quick select that uses Clustered PK, if there is one. This quick 
+    select is not used for row retrieval, it is used for row retrieval.
+  */
+  QUICK_RANGE_SELECT *cpk_quick;
+
+  MEM_ROOT alloc; /* Memory pool for this and merged quick selects data. */
+  THD *thd;       /* current thread */
+  bool need_to_fetch_row; /* if true, do retrieve full table records. */
+};
+
+
+/*
+  Rowid-Ordered Retrieval index union select.
+  This quick select produces union of row sequences returned by several
+  quick select it "merges".
+
+  All merged quick selects must return rowids in rowid order. 
+  QUICK_ROR_UNION_SELECT will return rows in rowid order, too.
+
+  All merged quick selects are set not to retrieve full table records.
+  ROR-union quick select always retrieves full records.
+ 
+*/
+
+class QUICK_ROR_UNION_SELECT : public QUICK_SELECT_I 
+{
+public:
+  QUICK_ROR_UNION_SELECT(THD *thd, TABLE *table);
+  ~QUICK_ROR_UNION_SELECT();
+
+  int  init();
+  int  reset(void);
+  int  get_next();
+  bool reverse_sorted() { return false; }
+  bool unique_key_range() { return false; }
+  int get_type() { return QS_TYPE_ROR_UNION; }
+  void add_keys_and_lengths(String *key_names, String *used_lengths);
+  void add_info_string(String *str);
+  bool check_if_keys_used(List<Item> *fields);
+#ifndef DBUG_OFF
+  void dbug_dump(int indent, bool verbose);
+#endif
+
+  bool push_quick_back(QUICK_SELECT_I *quick_sel_range);
+
+  List<QUICK_SELECT_I> quick_selects; /* Merged quick selects */
+  
+  QUEUE queue;    /* Priority queue for merge operation */
+  MEM_ROOT alloc; /* Memory pool for this and merged quick selects data. */
+
+  THD *thd;             /* current thread */
+  byte *cur_rowid;      /* buffer used in get_next() */
+  byte *prev_rowid;     /* rowid of last row returned by get_next() */
+  bool have_prev_rowid; /* true if prev_rowid has valid data */
+  uint rowid_length;    /* table rowid length */ 
+private:
+  static int queue_cmp(void *arg, byte *val1, byte *val2);
+};
+
+
 class QUICK_SELECT_DESC: public QUICK_RANGE_SELECT
 {
 public:

sql/sql_delete.cc

@@ -291,10 +291,10 @@ int mysql_prepare_delete(THD *thd, TABLE_LIST *table_list, Item **conds)
 
 #define MEM_STRIP_BUF_SIZE current_thd->variables.sortbuff_size
 
-extern "C" int refposcmp2(void* arg, const void *a,const void *b)
+extern "C" int refpos_order_cmp(void* arg, const void *a,const void *b)
 {
-  /* arg is a pointer to file->ref_length */
-  return memcmp(a,b, *(int*) arg);
+  handler *file= (handler*)arg;
+  return file->cmp_ref((const byte*)a, (const byte*)b);
 }
 
 multi_delete::multi_delete(THD *thd_arg, TABLE_LIST *dt,
@@ -358,8 +358,8 @@ multi_delete::initialize_tables(JOIN *join)
   for (walk=walk->next ; walk ; walk=walk->next)
   {
     TABLE *table=walk->table;
-    *tempfiles_ptr++= new Unique (refposcmp2,
-				  (void *) &table->file->ref_length,
+    *tempfiles_ptr++= new Unique (refpos_order_cmp,
+				  (void *) table->file,
 				  table->file->ref_length,
 				  MEM_STRIP_BUF_SIZE);
   }

sql/sql_select.cc

@@ -8061,8 +8061,16 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
   }
   else if (select && select->quick)		// Range found by opt_range
   {
-    /* assume results are not ordered when index merge is used */
-    if (select->quick->get_type() == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
+    int quick_type= select->quick->get_type();
+    /* 
+      assume results are not ordered when index merge is used 
+      TODO: sergeyp: Results of all index merge selects actually are ordered 
+      by clustered PK values.
+    */
+  
+    if (quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE || 
+        quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION || 
+        quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT)
       DBUG_RETURN(0);
     ref_key=	   select->quick->index;
     ref_key_parts= select->quick->used_key_parts;
@@ -8123,9 +8131,11 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
 	  */
 	  if (!select->quick->reverse_sorted())
 	  {
+            int quick_type= select->quick->get_type();
             if (table->file->index_flags(ref_key) & HA_NOT_READ_PREFIX_LAST ||
-                (select->quick->get_type() == 
-                QUICK_SELECT_I::QS_TYPE_INDEX_MERGE))
+                quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE ||
+                quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT ||
+                quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION)
               DBUG_RETURN(0);			// Use filesort
             
             // ORDER BY range_key DESC
@@ -10105,6 +10115,7 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
   select_result *result=join->result;
   Item *item_null= new Item_null();
   CHARSET_INFO *cs= system_charset_info;
+  int quick_type;
   DBUG_ENTER("select_describe");
   DBUG_PRINT("info", ("Select 0x%lx, type %s, message %s",
 		      (ulong)join->select_lex, join->select_lex->type,
@@ -10196,17 +10207,20 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
     {
       JOIN_TAB *tab=join->join_tab+i;
       TABLE *table=tab->table;
-      char buff[512],*buff_ptr=buff;
+      char buff[512]; 
       char buff1[512], buff2[512], buff3[512];
       char keylen_str_buf[64];
+      String extra(buff, sizeof(buff),cs);
       char table_name_buffer[NAME_LEN];
       String tmp1(buff1,sizeof(buff1),cs);
       String tmp2(buff2,sizeof(buff2),cs);
       String tmp3(buff3,sizeof(buff3),cs);
+      extra.length(0);
       tmp1.length(0);
       tmp2.length(0);
       tmp3.length(0);
 
+      quick_type= -1;
       item_list.empty();
       /* id */
       item_list.push_back(new Item_uint((uint32)
@@ -10217,8 +10231,10 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
 					  cs));
       if (tab->type == JT_ALL && tab->select && tab->select->quick)
       {
-        if (tab->select->quick->get_type() == 
-            QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
+        quick_type= tab->select->quick->get_type();
+        if ((quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE) ||
+            (quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT) ||
+            (quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION))
           tab->type = JT_INDEX_MERGE;
         else
 	  tab->type = JT_RANGE;
@@ -10241,7 +10257,7 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
 					  strlen(join_type_str[tab->type]),
 					  cs));
       uint j;
-      /* possible_keys */
+      /* Build "possible_keys" value and add it to item_list */
       if (!tab->keys.is_clear_all())
       {
         for (j=0 ; j < table->keys ; j++)
@@ -10260,7 +10276,8 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
 	item_list.push_back(new Item_string(tmp1.ptr(),tmp1.length(),cs));
       else
 	item_list.push_back(item_null);
-      /* key key_len ref */
+
+      /* Build "key", "key_len", and "ref" values and add them to item_list */
       if (tab->ref.key_parts)
       {
 	KEY *key_info=table->key_info+ tab->ref.key;
@@ -10296,48 +10313,9 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
       }
       else if (tab->select && tab->select->quick)
       {
-        if (tab->select->quick->get_type() == 
-            QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
-        {
-          QUICK_INDEX_MERGE_SELECT *quick_imerge=
-            (QUICK_INDEX_MERGE_SELECT*)tab->select->quick;
-          QUICK_RANGE_SELECT *quick;
-
-          List_iterator_fast<QUICK_RANGE_SELECT> it(quick_imerge->
-                                                    quick_selects);
-          while ((quick= it++))
-          {
-	    KEY *key_info= table->key_info + quick->index;
-            register uint length;
-            if (tmp3.length())
-	      tmp3.append(',');
-	    
-            tmp3.append(key_info->name);
-
-	    if (tmp2.length())
-	      tmp2.append(',');
-
-            length= longlong2str(quick->max_used_key_length, keylen_str_buf,
-                                 10) - 
-                    keylen_str_buf;
-
-            tmp2.append(keylen_str_buf, length);
-          }
-        }
-        else
-        {
-	  KEY *key_info= table->key_info + tab->select->quick->index;
-          register uint length;
-          tmp3.append(key_info->name);
-          
-          length= longlong2str(tab->select->quick->max_used_key_length, 
-                               keylen_str_buf, 10) -
-                  keylen_str_buf;
-          tmp2.append(keylen_str_buf, length);
-        }
-
-	item_list.push_back(new Item_string(tmp3.ptr(),tmp3.length(),cs));
+        tab->select->quick->add_keys_and_lengths(&tmp2, &tmp3);
 	item_list.push_back(new Item_string(tmp2.ptr(),tmp2.length(),cs));
+	item_list.push_back(new Item_string(tmp3.ptr(),tmp3.length(),cs));
 	item_list.push_back(item_null);
       }
       else
@@ -10346,52 +10324,68 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
 	item_list.push_back(item_null);
 	item_list.push_back(item_null);
       }
-      /* rows */
+      /* Add "rows" field to item_list. */
       item_list.push_back(new Item_int((longlong) (ulonglong)
 				       join->best_positions[i]. records_read,
 				       21));
-      /* extra */
+      /* Build "Extra" field and add it to item_list. */
       my_bool key_read=table->key_read;
       if ((tab->type == JT_NEXT || tab->type == JT_CONST) &&
           table->used_keys.is_set(tab->index))
 	key_read=1;
+      if (quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT &&
+          !((QUICK_ROR_INTERSECT_SELECT*)tab->select->quick)->need_to_fetch_row)
+        key_read=1;
         
       if (tab->info)
 	item_list.push_back(new Item_string(tab->info,strlen(tab->info),cs));
       else
       {
+        if (quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION || 
+            quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT ||
+            quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
+        {
+          extra.append("; Using ");
+          tab->select->quick->add_info_string(&extra);
+        }
 	if (tab->select)
 	{
 	  if (tab->use_quick == 2)
 	  {
             char buf[MAX_KEY/8+1];
-	    sprintf(buff_ptr,"; Range checked for each record (index map: 0x%s)",
-                tab->keys.print(buf));
-	    buff_ptr=strend(buff_ptr);
+            extra.append("; Range checked for each record (index map: 0x");
+            extra.append(tab->keys.print(buf));
+            extra.append(')');
 	  }
 	  else
-	    buff_ptr=strmov(buff_ptr,"; Using where");
+            extra.append("; Using where");
 	}
 	if (key_read)
-	  buff_ptr= strmov(buff_ptr,"; Using index");
+	  extra.append("; Using index");
 	if (table->reginfo.not_exists_optimize)
-	  buff_ptr= strmov(buff_ptr,"; Not exists");
+	  extra.append("; Not exists");
 	if (need_tmp_table)
 	{
 	  need_tmp_table=0;
-	  buff_ptr= strmov(buff_ptr,"; Using temporary");
+	  extra.append("; Using temporary");
 	}
 	if (need_order)
 	{
 	  need_order=0;
-	  buff_ptr= strmov(buff_ptr,"; Using filesort");
+	  extra.append("; Using filesort");
 	}
 	if (distinct & test_all_bits(used_tables,thd->used_tables))
-	  buff_ptr= strmov(buff_ptr,"; Distinct");
-	if (buff_ptr == buff)
-	  buff_ptr+= 2;				// Skip inital "; "
-	item_list.push_back(new Item_string(buff+2,(uint) (buff_ptr - buff)-2,
-					    cs));
+	  extra.append("; Distinct");
+        
+        /* Skip initial "; "*/
+        const char *str= extra.ptr();
+        uint32 len= extra.length();
+        if (len)
+        {
+          str += 2;
+          len -= 2;
+        }
+	item_list.push_back(new Item_string(str, len, cs));
       }
       // For next iteration
       used_tables|=table->map;

sql/sql_select.h

@@ -340,7 +340,7 @@ uint find_shortest_key(TABLE *table, const key_map *usable_keys);
 int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds);
 
 /* from sql_delete.cc, used by opt_range.cc */
-extern "C" int refposcmp2(void* arg, const void *a,const void *b);
+extern "C" int refpos_order_cmp(void* arg, const void *a,const void *b);
 
 /* class to copying an field/item to a key struct */
 

sql/sql_test.cc

@@ -182,37 +182,8 @@ TEST_join(JOIN *join)
 		tab->select->quick_keys.print(buf));
       else if (tab->select->quick)
       {
-        int quick_type= tab->select->quick->get_type();
-        if ((quick_type == QUICK_SELECT_I::QS_TYPE_RANGE) || 
-            (quick_type == QUICK_SELECT_I::QS_TYPE_RANGE_DESC))
-        {
-	  fprintf(DBUG_FILE,
-                "                  quick select used on key %s, length: %d\n",
-		form->key_info[tab->select->quick->index].name,
-		tab->select->quick->max_used_key_length);
-        }
-        else if (quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
-        {
-          QUICK_INDEX_MERGE_SELECT *quick_imerge= 
-              (QUICK_INDEX_MERGE_SELECT*)tab->select->quick;
-          QUICK_RANGE_SELECT *quick;
-          fprintf(DBUG_FILE,
-                  "                  index_merge quick select used\n");
-                    
-          List_iterator_fast<QUICK_RANGE_SELECT> it(quick_imerge->quick_selects);
-          while ((quick = it++))
-          {
-  	    fprintf(DBUG_FILE,
-                "                  range quick select: key %s, length: %d\n",
-		form->key_info[quick->index].name,
-		quick->max_used_key_length);
-          }
-        }
-        else
-        {
-          fprintf(DBUG_FILE,
-                  "                  quick select of unknown nature used\n");
-        }
+	fprintf(DBUG_FILE, "                  quick select used:\n");
+        tab->select->quick->dbug_dump(18, false);
       }
       else
 	VOID(fputs("                  select used\n",DBUG_FILE));

sql/sql_update.cc

@@ -156,18 +156,12 @@ int mysql_update(THD *thd,
   }
   init_ftfuncs(thd, &thd->lex->select_lex, 1);
   /* Check if we are modifying a key that we are used to search with */
+  
   if (select && select->quick)
-  {
-    if (select->quick->get_type() != QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
   {
     used_index= select->quick->index;
     used_key_is_modified= (!select->quick->unique_key_range() &&
-			      check_if_key_used(table,used_index,fields));
-    }
-    else
-    {
-      used_key_is_modified= true;
-    }
+                          select->quick->check_if_keys_used(&fields));
   }
   else if ((used_index=table->file->key_used_on_scan) < MAX_KEY)
     used_key_is_modified=check_if_key_used(table, used_index, fields);
@@ -180,7 +174,7 @@ int mysql_update(THD *thd,
       matching rows before updating the table!
     */
     table->file->extra(HA_EXTRA_RETRIEVE_ALL_COLS);
-    if (old_used_keys.is_set(used_index))
+    if ( (used_index != MAX_KEY) && old_used_keys.is_set(used_index))
     {
       table->key_read=1;
       table->file->extra(HA_EXTRA_KEYREAD);
@@ -286,6 +280,9 @@ int mysql_update(THD *thd,
 
   if (handle_duplicates == DUP_IGNORE)
     table->file->extra(HA_EXTRA_IGNORE_DUP_KEY);
+  
+  if (select && select->quick && select->quick->reset())
+        goto err;
   init_read_record(&info,thd,table,select,0,1);
 
   updated= found= 0;
@@ -833,26 +830,7 @@ static bool safe_update_on_fly(JOIN_TAB *join_tab, List<Item> *fields)
   case JT_ALL:
     /* If range search on index */
     if (join_tab->quick)
-    {
-      if (join_tab->quick->get_type() != QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
-      {
-        return !check_if_key_used(table,join_tab->quick->index,*fields);
-      }
-      else
-      {
-        QUICK_INDEX_MERGE_SELECT *qsel_imerge=
-          (QUICK_INDEX_MERGE_SELECT*)(join_tab->quick);
-        List_iterator_fast<QUICK_RANGE_SELECT> it(qsel_imerge->quick_selects);
-        QUICK_RANGE_SELECT *quick;
-        while ((quick= it++))
-        {
-          if (check_if_key_used(table, quick->index, *fields))
-            return 0;
-        }
-        return 1;
-      }
-    }
-
+      return !join_tab->quick->check_if_keys_used(fields);
     /* If scanning in clustered key */
     if ((table->file->table_flags() & HA_PRIMARY_KEY_IN_READ_INDEX) &&
 	table->primary_key < MAX_KEY)