Fix for bug#15533 crash, information_schema, function, view

  enable view prepared mode during getting metedata for I_S table

mysql-test/r/information_schema.result

@@ -1074,3 +1074,19 @@ character_maximum_length	character_octet_length
 32	32
 64	64
 drop table t1;
+CREATE TABLE t1 (f1 BIGINT, f2 VARCHAR(20), f3 BIGINT);
+INSERT INTO t1 SET f1 = 1, f2 = 'Schoenenbourg', f3 = 1;
+CREATE FUNCTION func2() RETURNS BIGINT RETURN 1;
+CREATE FUNCTION func1() RETURNS BIGINT
+BEGIN
+RETURN ( SELECT COUNT(*) FROM INFORMATION_SCHEMA.VIEWS);
+END//
+CREATE VIEW v1 AS SELECT 1 FROM t1
+WHERE f3 = (SELECT func2 ());
+SELECT func1();
+func1()
+1
+DROP TABLE t1;
+DROP VIEW v1;
+DROP FUNCTION func1;
+DROP FUNCTION func2;

mysql-test/t/information_schema.test

@@ -767,3 +767,26 @@ create table t1(f1 binary(32), f2 varbinary(64));
 select character_maximum_length, character_octet_length
 from information_schema.columns where table_name='t1';
 drop table t1;
+
+#
+# Bug#15533 crash, information_schema, function, view
+#
+CREATE TABLE t1 (f1 BIGINT, f2 VARCHAR(20), f3 BIGINT);
+INSERT INTO t1 SET f1 = 1, f2 = 'Schoenenbourg', f3 = 1;
+
+CREATE FUNCTION func2() RETURNS BIGINT RETURN 1;
+
+delimiter //;
+CREATE FUNCTION func1() RETURNS BIGINT
+BEGIN
+  RETURN ( SELECT COUNT(*) FROM INFORMATION_SCHEMA.VIEWS);
+END//
+delimiter ;//
+
+CREATE VIEW v1 AS SELECT 1 FROM t1
+                    WHERE f3 = (SELECT func2 ());
+SELECT func1();
+DROP TABLE t1;
+DROP VIEW v1;
+DROP FUNCTION func1;
+DROP FUNCTION func2;

sql/sql_show.cc

@@ -2045,6 +2045,8 @@ int get_all_tables(THD *thd, TABLE_LIST *tables, COND *cond)
   int error= 1;
   db_type not_used;
   Open_tables_state open_tables_state_backup;
+  bool save_view_prepare_mode= lex->view_prepare_mode;
+  lex->view_prepare_mode= TRUE;
   DBUG_ENTER("get_all_tables");
 
   LINT_INIT(end);
@@ -2230,6 +2232,7 @@ err:
   lex->derived_tables= derived_tables;
   lex->all_selects_list= old_all_select_lex;
   lex->query_tables_last= save_query_tables_last;
+  lex->view_prepare_mode= save_view_prepare_mode;
   *save_query_tables_last= 0;
   lex->sql_command= save_sql_command;
   DBUG_RETURN(error);