BUG#730133: Wrong result with jkl = 7, BKA, ICP in maria-5.3 + compound index

- Mrr_ordered_index_reader::interrupt_read() and resume_read() should 
  save/restore not just index lookup tuple, but entire index tuple.
  Key parts that are not used for index lookup can be still used in
  pushed index condition. Failure to save/restore will cause the index
  condition to be evaluated over the wrong values.

mysql-test/r/myisam_mrr.result

@@ -509,5 +509,44 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	table3	ref	PRIMARY,col_varchar_key	col_varchar_key	3	test.table2.col_varchar_key	3	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 set join_cache_level= @save_join_cache_level;
 set join_buffer_size= @save_join_buffer_size;
-set optimizer_switch= @myisam_mrr_tmp;
 drop table t1;
+#
+# BUG#730133: Wrong result with jkl = 7, BKA, ICP in maria-5.3 + compound index
+#
+set @tmp_730133_jcl= @@join_cache_level;
+set join_cache_level = 7;
+set @tmp_730133_os= @@optimizer_switch;
+set optimizer_switch= 'join_cache_hashed=off,join_cache_bka=on,index_condition_pushdown=on,optimize_join_buffer_size=on';
+CREATE TABLE t1 (f1 int, f2 int, f3 int, f4 int, f5 int, KEY (f4,f3));
+INSERT IGNORE INTO t1 VALUES ('2','9','5','0','0'),('4','7','0','0','0'),
+('6','97','190','0','0'),('7','3','6','0','0'),('11','101','186','0','0'),
+('14','194','226','0','0'),('15','148','133','0','0'),
+('16','9','6','0','0'),('17','9','3','0','0'),('18','1','8','0','0'),
+('19','1','5','0','0'),('20','5','7','0','0');
+explain
+SELECT COUNT(alias2.f2) 
+FROM 
+t1 STRAIGHT_JOIN 
+t1 AS alias3 STRAIGHT_JOIN 
+t1 AS alias2 FORCE KEY (f4) 
+WHERE 
+alias2.f4=alias3.f5  AND 
+alias2.f3 > alias3.f1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index	NULL	f4	10	NULL	12	Using index
+1	SIMPLE	alias3	ALL	NULL	NULL	NULL	NULL	12	Using where; Using join buffer (flat, BNL join)
+1	SIMPLE	alias2	ref	f4	f4	5	test.alias3.f5	2	Using index condition(BKA); Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
+SELECT COUNT(alias2.f2) 
+FROM 
+t1 STRAIGHT_JOIN 
+t1 AS alias3 STRAIGHT_JOIN 
+t1 AS alias2 FORCE KEY (f4) 
+WHERE 
+alias2.f4=alias3.f5  AND 
+alias2.f3 > alias3.f1;
+COUNT(alias2.f2)
+768
+set @@join_cache_level= @tmp_730133_jcl;
+set @@optimizer_switch= @tmp_730133_os;
+drop table t1;
+set optimizer_switch= @myisam_mrr_tmp;

mysql-test/t/myisam_mrr.test

@@ -218,6 +218,47 @@ where
 
 set join_cache_level= @save_join_cache_level;
 set join_buffer_size= @save_join_buffer_size;
-set optimizer_switch= @myisam_mrr_tmp;
 drop table t1;
 
+
+--echo #
+--echo # BUG#730133: Wrong result with jkl = 7, BKA, ICP in maria-5.3 + compound index
+--echo #
+set @tmp_730133_jcl= @@join_cache_level;
+set join_cache_level = 7;
+
+set @tmp_730133_os= @@optimizer_switch;
+set optimizer_switch= 'join_cache_hashed=off,join_cache_bka=on,index_condition_pushdown=on,optimize_join_buffer_size=on';
+
+CREATE TABLE t1 (f1 int, f2 int, f3 int, f4 int, f5 int, KEY (f4,f3));
+INSERT IGNORE INTO t1 VALUES ('2','9','5','0','0'),('4','7','0','0','0'),
+  ('6','97','190','0','0'),('7','3','6','0','0'),('11','101','186','0','0'),
+  ('14','194','226','0','0'),('15','148','133','0','0'),
+  ('16','9','6','0','0'),('17','9','3','0','0'),('18','1','8','0','0'),
+  ('19','1','5','0','0'),('20','5','7','0','0');
+
+explain
+SELECT COUNT(alias2.f2) 
+FROM 
+  t1 STRAIGHT_JOIN 
+  t1 AS alias3 STRAIGHT_JOIN 
+  t1 AS alias2 FORCE KEY (f4) 
+WHERE 
+  alias2.f4=alias3.f5  AND 
+  alias2.f3 > alias3.f1;
+
+SELECT COUNT(alias2.f2) 
+FROM 
+  t1 STRAIGHT_JOIN 
+  t1 AS alias3 STRAIGHT_JOIN 
+  t1 AS alias2 FORCE KEY (f4) 
+WHERE 
+  alias2.f4=alias3.f5  AND 
+  alias2.f3 > alias3.f1;
+
+set @@join_cache_level= @tmp_730133_jcl;
+set @@optimizer_switch= @tmp_730133_os;
+drop table t1;
+
+## This must be last line in the file:
+set optimizer_switch= @myisam_mrr_tmp;

sql/item.cc

@@ -9124,7 +9124,22 @@ table_map Item_ref_null_helper::used_tables() const
 }
 
 
+/* Debugger help function */
+static char dbug_item_print_buf[256];
 
+const char *dbug_print_item(Item *item)
+{
+  char *buf= dbug_item_print_buf;
+  String str(buf, sizeof(dbug_item_print_buf), &my_charset_bin);
+  str.length(0);
+  if (!item)
+    return "(Item*)NULL";
+  item->print(&str ,QT_ORDINARY);
+  if (str.c_ptr() == buf)
+    return buf;
+  else
+    return "Couldn't fit into buffer";
+}
 /*****************************************************************************
 ** Instantiate templates
 *****************************************************************************/

sql/multi_range_read.cc

@@ -424,10 +424,10 @@ void Mrr_ordered_index_reader::interrupt_read()
 {
   DBUG_ASSERT(support_scan_interruptions);
   TABLE *table= file->get_table();
+  KEY *used_index= &table->key_info[file->active_index];
   /* Save the current key value */
   key_copy(saved_key_tuple, table->record[0],
-           &table->key_info[file->active_index],
-           keypar.key_tuple_length);
+           used_index, used_index->key_length);
   
   if (saved_primary_key)
   {
@@ -452,9 +452,9 @@ void Mrr_ordered_index_reader::position()
 void Mrr_ordered_index_reader::resume_read()
 {
   TABLE *table= file->get_table();
+  KEY *used_index= &table->key_info[file->active_index];
   key_restore(table->record[0], saved_key_tuple, 
-              &table->key_info[file->active_index],
-              keypar.key_tuple_length);
+              used_index, used_index->key_length);
   if (saved_primary_key)
   {
     key_restore(table->record[0], saved_primary_key, 
@@ -531,7 +531,7 @@ int Mrr_ordered_index_reader::init(handler *h_arg, RANGE_SEQ_IF *seq_funcs,
   mrr_funcs= *seq_funcs;
   source_exhausted= FALSE;
   if (support_scan_interruptions)
-    bzero(saved_key_tuple, keypar.key_tuple_length);
+    bzero(saved_key_tuple, key_info->key_length);
   have_saved_rowid= FALSE;
   return 0;
 }
@@ -850,10 +850,11 @@ int DsMrr_impl::dsmrr_init(handler *h_arg, RANGE_SEQ_IF *seq_funcs,
         uint pk= h_idx->get_table()->s->primary_key;
         saved_pk_length= h_idx->get_table()->key_info[pk].key_length;
       }
-
+      
+      KEY *used_index= &h_idx->get_table()->key_info[h_idx->active_index];
       if (reader_factory.ordered_index_reader.
             set_interruption_temp_buffer(primary_file->ref_length,
-                                         keypar.key_tuple_length,
+                                         used_index->key_length,
                                          saved_pk_length,
                                          &full_buf, full_buf_end))
         goto use_default_impl;