Fixed LP bug #892725.

A non-first execution of a prepared statement missed a call of the
TABLE_LIST::process_index_hints() method in the code of the function
setup_tables().
At some scenarios this could lead to the choice of a quite inefficient
execution plan for the base query of the prepared statement.

mysql-test/r/ps.result

@@ -3058,3 +3058,60 @@ date('2010-10-10') between '2010-09-09' and ?
 execute stmt using @a;
 date('2010-10-10') between '2010-09-09' and ?
 0
+#
+# Bug #892725: look-up is changed for a full scan when executing PS
+#
+create table t1 (a int primary key, b int);
+insert into t1 values
+(7,70), (3,40), (4,40), (8,70), (1,70), (9,50), (2,70);
+prepare st from 'select * from t1 where a=8';
+flush status;
+execute st;
+a	b
+8	70
+show status like '%Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	1
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	0
+flush status;
+execute st;
+a	b
+8	70
+show status like '%Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	1
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	0
+flush status;
+select * from t1 use index() where a=3;
+a	b
+3	40
+show status like '%Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	0
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	8
+flush status;
+execute st;
+a	b
+8	70
+show status like '%Handler_read%';
+Variable_name	Value
+Handler_read_first	0
+Handler_read_key	1
+Handler_read_next	0
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	0
+deallocate prepare st;
+drop table t1;

mysql-test/t/ps.test

@@ -3119,3 +3119,30 @@ set @a='2010-08-08';
 execute stmt using @a;
 execute stmt using @a;
 
+--echo #
+--echo # Bug #892725: look-up is changed for a full scan when executing PS
+--echo #
+
+create table t1 (a int primary key, b int);
+insert into t1 values
+  (7,70), (3,40), (4,40), (8,70), (1,70), (9,50), (2,70);
+
+prepare st from 'select * from t1 where a=8';
+
+flush status;
+execute st;
+show status like '%Handler_read%';
+flush status;
+execute st;
+show status like '%Handler_read%';
+flush status;
+select * from t1 use index() where a=3;
+show status like '%Handler_read%';
+flush status;
+execute st;
+show status like '%Handler_read%';
+
+deallocate prepare st;
+
+drop table t1;
+  

sql/sql_base.cc

@@ -7864,6 +7864,8 @@ bool setup_tables(THD *thd, Name_resolution_context *context,
         table_list->table->map= table_list->map_exec;
         table_list->table->maybe_null= table_list->maybe_null_exec;
         table_list->table->pos_in_table_list= table_list;
+        if (table_list->process_index_hints(table_list->table))
+          DBUG_RETURN(1);
       }
       select_lex->leaf_tables.push_back(table_list);
     }