Bug#30795 Query on INFORMATION_SCHEMA.SCHEMATA, wrong result

skip the check of directory presence for 'information_schema' name

mysql-test/r/information_schema.result

@@ -1552,4 +1552,8 @@ VIEW_DEFINITION
 SELECT *
 FROM INFORMATION_SCHEMA.TABLES
 DROP VIEW v1;
+SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA
+WHERE SCHEMA_NAME ='information_schema';
+SCHEMA_NAME
+information_schema
 End of 5.1 tests.

mysql-test/t/information_schema.test

@@ -1188,4 +1188,10 @@ FROM INFORMATION_SCHEMA.TABLES;
 SELECT VIEW_DEFINITION FROM INFORMATION_SCHEMA.VIEWS where TABLE_NAME = 'v1';
 DROP VIEW v1;
 
+#
+# Bug#30795 Query on INFORMATION_SCHEMA.SCHEMATA, wrong result
+#
+SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA
+WHERE SCHEMA_NAME ='information_schema';
+
 --echo End of 5.1 tests.

sql/sql_show.cc

@@ -3339,7 +3339,8 @@ int fill_schema_schemata(THD *thd, TABLE_LIST *tables, COND *cond)
   /*
     If we have lookup db value we should check that the database exists
   */
-  if(lookup_field_vals.db_value.str && !lookup_field_vals.wild_db_value)
+  if(lookup_field_vals.db_value.str && !lookup_field_vals.wild_db_value &&
+     !with_i_schema)
   {
     char path[FN_REFLEN+16];
     uint path_len;