Closing tables during SP execution the proper way.

mysql-test/r/show_check.result:
  proc table now shows up in different places.
mysql-test/r/status.result:
  proc table now shows up in different places.
sql/sp.cc:
  Fixed closing of tables.
sql/sp_head.cc:
  Close tables after each sub statement.
sql/sql_class.cc:
  Removed closing of tables in various send_eof() methods again.

mysql-test/r/show_check.result

@@ -127,6 +127,7 @@ insert into t1 values (1);
 show open tables;
 Database	Table	In_use	Name_locked
 test	t1	0	0
+mysql	proc	0	0
 drop table t1;
 create table t1 (a int not null, b VARCHAR(10), INDEX (b) ) AVG_ROW_LENGTH=10 CHECKSUM=1 COMMENT="test" TYPE=MYISAM MIN_ROWS=10 MAX_ROWS=100 PACK_KEYS=1 DELAY_KEY_WRITE=1 ROW_FORMAT=fixed;
 show create table t1;

mysql-test/r/status.result

@@ -14,6 +14,6 @@ update t1 set n = 3;
 unlock tables;
 show status like 'Table_lock%';
 Variable_name	Value
-Table_locks_immediate	3
+Table_locks_immediate	4
 Table_locks_waited	1
 drop table t1;

sql/sp.cc

@@ -50,13 +50,16 @@ db_find_routine_aux(THD *thd, int type, char *name, uint namelen,
   tables.db= (char*)"mysql";
   tables.real_name= tables.alias= (char*)"proc";
   if (! (table= open_ltable(thd, &tables, ltype)))
+  {
+    *tablep= NULL;
     DBUG_RETURN(SP_OPEN_TABLE_FAILED);
+  }
 
   if (table->file->index_read_idx(table->record[0], 0,
 				  key, keylen,
 				  HA_READ_KEY_EXACT))
   {
-    close_thread_tables(thd);
+    *tablep= NULL;
     DBUG_RETURN(SP_KEY_NOT_FOUND);
   }
   *tablep= table;
@@ -94,7 +97,7 @@ db_find_routine(THD *thd, int type, char *name, uint namelen, sp_head **sphp)
     *sphp= tmplex->sphead;
 
  done:
-  if (ret != SP_OK && table)
+  if (table)
     close_thread_tables(thd);
   DBUG_RETURN(ret);
 }
@@ -129,7 +132,6 @@ db_create_routine(THD *thd, int type,
       ret= SP_OK;
   }
 
-  if (ret == SP_OK && table)
   close_thread_tables(thd);
   DBUG_RETURN(ret);
 }
@@ -149,7 +151,6 @@ db_drop_routine(THD *thd, int type, char *name, uint namelen)
       ret= SP_DELETE_ROW_FAILED;
   }
 
-  if (ret == SP_OK && table)
   close_thread_tables(thd);
   DBUG_RETURN(ret);
 }
@@ -251,12 +252,13 @@ bool
 sp_function_exists(THD *thd, LEX_STRING *name)
 {
   TABLE *table;
+  bool ret= FALSE;
 
   if (db_find_routine_aux(thd, TYPE_ENUM_FUNCTION,
 			  name->str, name->length, TL_READ, &table) == SP_OK)
   {
+    ret= TRUE;
+  }
   close_thread_tables(thd);
-    return TRUE;
+  return ret;
-  }
-  return FALSE;
 }

sql/sp_head.cc

@@ -415,6 +415,11 @@ sp_instr_stmt::execute(THD *thd, uint *nextp)
   thd->lex.thd = thd;
 
   res= mysql_execute_command(thd);
+  if (thd->lock || thd->open_tables || thd->derived_tables)
+  {
+    thd->proc_info="closing tables";
+    close_thread_tables(thd);			/* Free tables */
+  }
 
   memcpy(&thd->lex, &olex, sizeof(LEX)); // Restore the other lex
 

sql/sql_class.cc

@@ -801,15 +801,6 @@ void select_export::send_error(uint errcode, const char *err)
 
 bool select_export::send_eof()
 {
-  /* This mimics select_send::send_eof(), which unlocks this way.
-   * It appears to be necessary, since tables aren't unlock after
-   * selects otherwise.
-   */
-  if (thd->lock)
-  {
-    mysql_unlock_tables(thd, thd->lock);
-    thd->lock=0;
-  }
   int error=test(end_io_cache(&cache));
   if (my_close(file,MYF(MY_WME)))
     error=1;
@@ -920,15 +911,6 @@ void select_dump::send_error(uint errcode,const char *err)
 
 bool select_dump::send_eof()
 {
-  /* This mimics select_send::send_eof(), which unlocks this way.
-   * It appears to be necessary, since tables aren't unlock after
-   * selects otherwise.
-   */
-  if (thd->lock)
-  {
-    mysql_unlock_tables(thd, thd->lock);
-    thd->lock=0;
-  }
   int error=test(end_io_cache(&cache));
   if (my_close(file,MYF(MY_WME)))
     error=1;
@@ -1061,15 +1043,6 @@ bool select_dumpvar::send_data(List<Item> &items)
 
 bool select_dumpvar::send_eof()
 {
-  /* This mimics select_send::send_eof(), which unlocks this way.
-   * It appears to be necessary, since tables aren't unlock after
-   * selects otherwise.
-   */
-  if (thd->lock)
-  {
-    mysql_unlock_tables(thd, thd->lock);
-    thd->lock=0;
-  }
   if (row_count)
   {
     ::send_ok(thd,row_count);