Fixed BUG#8757: Stored Procedures: Scope of Begin and End Statements do not work properly.

mysql-test/r/sp.result:
  New test case for BUG#8757.
mysql-test/t/sp.test:
  New test case for BUG#8757.
sql/sp_pcontext.cc:
  Return the correct scope offset to cursors during parsing.

mysql-test/r/sp.result

@@ -2174,6 +2174,36 @@ end if;
 select plus;
 end|
 drop procedure bug6857|
+drop procedure if exists bug8757|
+create procedure bug8757()
+begin
+declare x int;
+declare c1 cursor for select data from t1 limit 1;
+begin
+declare y int;
+declare c2 cursor for select i from t2 limit 1;
+open c2;
+fetch c2 into y;
+close c2;
+select 2,y;
+end;
+open c1;
+fetch c1 into x;
+close c1;
+select 1,x;
+end|
+delete from t1|
+delete from t2|
+insert into t1 values ("x", 1)|
+insert into t2 values ("y", 2, 0.0)|
+call bug8757()|
+2	y
+2	2
+1	x
+1	1
+delete from t1|
+delete from t2|
+drop procedure bug8757|
 drop table if exists fac|
 create table fac (n int unsigned not null primary key, f bigint unsigned)|
 drop procedure if exists ifac|

mysql-test/t/sp.test

@@ -2676,6 +2676,43 @@ end|
 
 drop procedure bug6857|
 
+#
+# BUG#8757: Stored Procedures: Scope of Begin and End Statements do not
+#           work properly.
+--disable_warnings
+drop procedure if exists bug8757|
+--enable_warnings
+create procedure bug8757()
+begin
+  declare x int;
+  declare c1 cursor for select data from t1 limit 1;
+
+  begin
+    declare y int;
+    declare c2 cursor for select i from t2 limit 1;
+
+    open c2;
+    fetch c2 into y;
+    close c2;
+    select 2,y;
+  end;
+  open c1;
+  fetch c1 into x;
+  close c1;
+  select 1,x;
+end|
+
+delete from t1|
+delete from t2|
+insert into t1 values ("x", 1)|
+insert into t2 values ("y", 2, 0.0)|
+
+call bug8757()|
+
+delete from t1|
+delete from t2|
+drop procedure bug8757|
+
 
 #
 # Some "real" examples

sql/sp_pcontext.cc

@@ -264,7 +264,7 @@ sp_pcontext::find_cursor(LEX_STRING *name, uint *poff, my_bool scoped)
 		     (const uchar *)name->str, name->length,
 		     (const uchar *)n.str, n.length) == 0)
     {
-      *poff= i;
+      *poff= m_coffset + i;
       return TRUE;
     }
   }