Fix for Bug#12995: Inside function "Table 't4' was not locked with LOCK TABLES"

Any form of HANDLER statement is forbidden from usage in stored procedures/functions.

mysql-test/r/sp-error.result

@@ -765,3 +765,24 @@ OPTIMIZE TABLE t1;
 RETURN 1;
 END|
 ERROR 0A000: OPTIMIZE TABLE is not allowed in stored procedures
+DROP FUNCTION IF EXISTS bug12995|
+CREATE FUNCTION bug12995() RETURNS INT
+BEGIN
+HANDLER t1 OPEN;
+RETURN 1;
+END|
+ERROR 0A000: HANDLER is not allowed in stored procedures
+CREATE FUNCTION bug12995() RETURNS INT
+BEGIN
+HANDLER t1 READ FIRST;
+RETURN 1;
+END|
+ERROR 0A000: HANDLER is not allowed in stored procedures
+CREATE FUNCTION bug12995() RETURNS INT
+BEGIN
+HANDLER t1 CLOSE;
+RETURN 1;
+END|
+ERROR 0A000: HANDLER is not allowed in stored procedures
+SELECT bug12995()|
+ERROR 42000: FUNCTION test.bug12995 does not exist

mysql-test/t/sp-error.test

@@ -1099,6 +1099,36 @@ BEGIN
   OPTIMIZE TABLE t1;
   RETURN 1;
 END|
+delimiter ;|
+
+#
+# Bug##12995 "Inside function "Table 't4' was not locked with LOCK TABLES"
+#
+delimiter |;
+--disable_warnings
+DROP FUNCTION IF EXISTS bug12995|
+--enable_warnings
+--error ER_SP_BADSTATEMENT
+CREATE FUNCTION bug12995() RETURNS INT
+BEGIN
+  HANDLER t1 OPEN;
+  RETURN 1;
+END|
+--error ER_SP_BADSTATEMENT
+CREATE FUNCTION bug12995() RETURNS INT
+BEGIN
+  HANDLER t1 READ FIRST;
+  RETURN 1;
+END|
+--error ER_SP_BADSTATEMENT
+CREATE FUNCTION bug12995() RETURNS INT
+BEGIN
+  HANDLER t1 CLOSE;
+  RETURN 1;
+END|
+--error 1305
+SELECT bug12995()|
+delimiter ;|
 
 #
 # BUG#NNNN: New bug synopsis

sql/sql_yacc.yy

@@ -8157,6 +8157,11 @@ handler:
 	HANDLER_SYM table_ident OPEN_SYM opt_table_alias
 	{
 	  LEX *lex= Lex;
+	  if (lex->sphead)
+	  {
+	    my_error(ER_SP_BADSTATEMENT, MYF(0), "HANDLER");
+	    YYABORT;
+	  }
 	  lex->sql_command = SQLCOM_HA_OPEN;
 	  if (!lex->current_select->add_table_to_list(lex->thd, $2, $4, 0))
 	    YYABORT;
@@ -8164,6 +8169,11 @@ handler:
 	| HANDLER_SYM table_ident_nodb CLOSE_SYM
 	{
 	  LEX *lex= Lex;
+	  if (lex->sphead)
+	  {
+	    my_error(ER_SP_BADSTATEMENT, MYF(0), "HANDLER");
+	    YYABORT;
+	  }
 	  lex->sql_command = SQLCOM_HA_CLOSE;
 	  if (!lex->current_select->add_table_to_list(lex->thd, $2, 0, 0))
 	    YYABORT;
@@ -8171,6 +8181,11 @@ handler:
 	| HANDLER_SYM table_ident_nodb READ_SYM
 	{
 	  LEX *lex=Lex;
+	  if (lex->sphead)
+	  {
+	    my_error(ER_SP_BADSTATEMENT, MYF(0), "HANDLER");
+	    YYABORT;
+	  }
 	  lex->sql_command = SQLCOM_HA_READ;
 	  lex->ha_rkey_mode= HA_READ_KEY_EXACT;	/* Avoid purify warnings */
 	  lex->current_select->select_limit= new Item_int((int32) 1);