Fix for bug#7211: information_schema: crash if bad view(after review)

mysql-test/r/information_schema.result

@@ -599,6 +599,18 @@ create view t3 (c) as select sub1(1);
 create table t4(f1 int, KEY f1_key (f1));
 drop table t1;
 drop function sub1;
+select table_name from information_schema.views
+where table_schema='test';
+table_name
+Warnings:
+Warning	1356	View 'test.t2' references invalid table(s) or column(s) or function(s)
+Warning	1356	View 'test.t3' references invalid table(s) or column(s) or function(s)
+select table_name from information_schema.views
+where table_schema='test';
+table_name
+Warnings:
+Warning	1356	View 'test.t2' references invalid table(s) or column(s) or function(s)
+Warning	1356	View 'test.t3' references invalid table(s) or column(s) or function(s)
 select column_name from information_schema.columns
 where table_schema='test';
 column_name

mysql-test/t/information_schema.test

@@ -295,6 +295,7 @@ show tables like "T%";
 
 #
 # Bug#7212: information_schema: "Can't find file" errors if storage engine gone
+# Bug#7211: information_schema: crash if bad view
 #
 use test;
 create function sub1(i int) returns int
@@ -305,6 +306,10 @@ create view t3 (c) as select sub1(1);
 create table t4(f1 int, KEY f1_key (f1));
 drop table t1;
 drop function sub1;
+select table_name from information_schema.views
+where table_schema='test';
+select table_name from information_schema.views
+where table_schema='test';
 select column_name from information_schema.columns
 where table_schema='test';
 select index_name from information_schema.statistics where table_schema='test';

sql/sql_show.cc

@@ -2871,7 +2871,14 @@ static int get_schema_views_record(THD *thd, struct st_table_list *tables,
       table->file->write_row(table->record[0]);
     }
   }
-  DBUG_RETURN(res);
+  else
+  {
+    if (tables->view)
+      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
+                   thd->net.last_errno, thd->net.last_error);
+    thd->clear_error();
+  }
+  DBUG_RETURN(0);
 }