Fix for BUG#13095: Cannot create VIEWs in prepared statements

  - allow CREATE VIEW as well as DROP VIEW to use in prepared statements;
  - fix CREATE VIEW implementation to make it work in prepared statements.


mysql-test/r/sp.result:
  Results file for the test case for BUG#13095.
mysql-test/t/sp.test:
  Test case for BUG#13095.
sql/sql_lex.h:
  Added a variable to remember start of whole CREATE VIEW statement
  as well as start of its SELECT part.
sql/sql_prepare.cc:
  Allow CREATE VIEW and DROP VIEW to use in prepared statements.
sql/sql_view.cc:
  Use stored start of whole CREATE VIEW statement instead of thd->query,
  which differs from the original when prepared statement is executing.
sql/sql_yacc.yy:
  Remember start of whole CREATE VIEW statement as well as start of its
  SELECT part.

mysql-test/r/sp.result

@@ -3532,4 +3532,47 @@ select @a|
 Local
 drop function bug13941|
 drop procedure bug13941|
+DROP PROCEDURE IF EXISTS bug13095;
+DROP TABLE IF EXISTS bug13095_t1;
+DROP VIEW IF EXISTS bug13095_v1;
+CREATE PROCEDURE bug13095(tbl_name varchar(32))
+BEGIN
+SET @str =
+CONCAT("CREATE TABLE ", tbl_name, "(stuff char(15))");
+SELECT @str;
+PREPARE stmt FROM @str;
+EXECUTE stmt;
+SET @str =
+CONCAT("INSERT INTO ", tbl_name, " VALUES('row1'),('row2'),('row3')" );
+SELECT @str;
+PREPARE stmt FROM @str;
+EXECUTE stmt;
+SET @str =
+CONCAT("CREATE VIEW bug13095_v1(c1) AS SELECT stuff FROM ", tbl_name);
+SELECT @str;
+PREPARE stmt FROM @str;
+EXECUTE stmt;
+SELECT * FROM bug13095_v1;
+SET @str =
+"DROP VIEW bug13095_v1";
+SELECT @str;
+PREPARE stmt FROM @str;
+EXECUTE stmt;
+END|
+CALL bug13095('bug13095_t1');
+@str
+CREATE TABLE bug13095_t1(stuff char(15))
+@str
+INSERT INTO bug13095_t1 VALUES('row1'),('row2'),('row3')
+@str
+CREATE VIEW bug13095_v1(c1) AS SELECT stuff FROM bug13095_t1
+c1
+row1
+row2
+row3
+@str
+DROP VIEW bug13095_v1
+DROP PROCEDURE IF EXISTS bug13095;
+DROP VIEW IF EXISTS bug13095_v1;
+DROP TABLE IF EXISTS bug13095_t1;
 drop table t1,t2;

mysql-test/t/sp.test

@@ -4433,6 +4433,62 @@ drop function bug13941|
 drop procedure bug13941|
 
 
+#
+# BUG#13095: Cannot create VIEWs in prepared statements
+#
+
+delimiter ;|
+
+--disable_warnings
+DROP PROCEDURE IF EXISTS bug13095;
+DROP TABLE IF EXISTS bug13095_t1;
+DROP VIEW IF EXISTS bug13095_v1;
+--enable_warnings
+
+delimiter |;
+
+CREATE PROCEDURE bug13095(tbl_name varchar(32))
+BEGIN
+  SET @str =
+    CONCAT("CREATE TABLE ", tbl_name, "(stuff char(15))");
+  SELECT @str;
+  PREPARE stmt FROM @str;
+  EXECUTE stmt;
+
+  SET @str =
+    CONCAT("INSERT INTO ", tbl_name, " VALUES('row1'),('row2'),('row3')" );
+  SELECT @str;
+  PREPARE stmt FROM @str;
+  EXECUTE stmt;
+
+  SET @str =
+    CONCAT("CREATE VIEW bug13095_v1(c1) AS SELECT stuff FROM ", tbl_name);
+  SELECT @str;
+  PREPARE stmt FROM @str;
+  EXECUTE stmt;
+
+  SELECT * FROM bug13095_v1;
+
+  SET @str =
+    "DROP VIEW bug13095_v1";
+  SELECT @str;
+  PREPARE stmt FROM @str;
+  EXECUTE stmt;
+END|
+
+delimiter ;|
+
+CALL bug13095('bug13095_t1');
+
+--disable_warnings
+DROP PROCEDURE IF EXISTS bug13095;
+DROP VIEW IF EXISTS bug13095_v1;
+DROP TABLE IF EXISTS bug13095_t1;
+--enable_warnings
+
+delimiter |;
+
+
 #
 # BUG#NNNN: New bug synopsis
 #

sql/sql_lex.h

@@ -738,6 +738,7 @@ typedef struct st_lex
   /* store original leaf_tables for INSERT SELECT and PS/SP */
   TABLE_LIST *leaf_tables_insert;
   st_lex_user *create_view_definer;
+  char *create_view_start;
   char *create_view_select_start;
 
   List<key_part_spec> col_list;

sql/sql_prepare.cc

@@ -1742,6 +1742,8 @@ static bool check_prepared_statement(Prepared_statement *stmt,
   case SQLCOM_ROLLBACK:
   case SQLCOM_TRUNCATE:
   case SQLCOM_CALL:
+  case SQLCOM_CREATE_VIEW:
+  case SQLCOM_DROP_VIEW:
     break;
 
   default:

sql/sql_view.cc

@@ -643,7 +643,8 @@ static int mysql_register_view(THD *thd, TABLE_LIST *view,
   view->query.length= str.length()-1; // we do not need last \0
   view->source.str= thd->lex->create_view_select_start;
   view->source.length= (thd->query_length -
-                        (thd->lex->create_view_select_start - thd->query));
+                        (thd->lex->create_view_select_start -
+                         thd->lex->create_view_start));
   view->file_version= 1;
   view->calc_md5(md5);
   view->md5.str= md5;

sql/sql_yacc.yy

@@ -1263,6 +1263,7 @@ create:
 	    THD *thd= YYTHD;
 	    LEX *lex= thd->lex;
 	    lex->sql_command= SQLCOM_CREATE_VIEW;
+            lex->create_view_start= thd->query;
 	    /* first table in list is target VIEW name */
 	    if (!lex->select_lex.add_table_to_list(thd, $7, NULL, 0))
               YYABORT;
@@ -3425,6 +3426,7 @@ alter:
 	    THD *thd= YYTHD;
 	    LEX *lex= thd->lex;
 	    lex->sql_command= SQLCOM_CREATE_VIEW;
+            lex->create_view_start= thd->query;
 	    lex->create_view_mode= VIEW_ALTER;
 	    /* first table in list is target VIEW name */
 	    lex->select_lex.add_table_to_list(thd, $6, NULL, 0);