Bug#41079 information_schema.schema_privileges is limited to 7680 records.

The problem is that we cannot insert new record into memory table
when table size exceeds max memory table size.
The fix is to use schema_table_store_record() function which
converts memory table into MyISAM in case of table size exceeding.

Note:
There is no test case for this bug, the reason is that
1. The code  that was added already is checked(i.e. works) with existing tests
2. Correct work of schema_table_store_record() is checked with other test cases
   (information_schema tests)
So new code is fully covered with existing test cases.

3 files changed, 87 insertions, 37 deletions

diff --git a/sql/mysql_priv.h b/sql/mysql_priv.h
index a06a7e7d6e3..8a8513ac745 100644
--- a/sql/mysql_priv.h
+++ b/sql/mysql_priv.h
@@ -983,6 +983,7 @@ int fill_schema_column_privileges(THD *thd, TABLE_LIST *tables, COND *cond);
 bool get_schema_tables_result(JOIN *join,
                               enum enum_schema_table_state executed_place);
 enum enum_schema_tables get_schema_table_idx(ST_SCHEMA_TABLE *schema_table);
+bool schema_table_store_record(THD *thd, TABLE *table);
 
 #define is_schema_db(X) \
   !my_strcasecmp(system_charset_info, INFORMATION_SCHEMA_NAME.str, (X))
diff --git a/sql/sql_acl.cc b/sql/sql_acl.cc
index df5e844749f..57029f46162 100644
--- a/sql/sql_acl.cc
+++ b/sql/sql_acl.cc
@@ -5953,10 +5953,11 @@ int wild_case_compare(CHARSET_INFO *cs, const char *str,const char *wildstr)
 }
 
 
-void update_schema_privilege(TABLE *table, char *buff, const char* db,
-                             const char* t_name, const char* column,
-                             uint col_length, const char *priv, 
-                             uint priv_length, const char* is_grantable)
+static bool update_schema_privilege(THD *thd, TABLE *table, char *buff,
+                                    const char* db, const char* t_name,
+                                    const char* column, uint col_length,
+                                    const char *priv, uint priv_length,
+                                    const char* is_grantable)
 {
   int i= 2;
   CHARSET_INFO *cs= system_charset_info;
@@ -5970,13 +5971,14 @@ void update_schema_privilege(TABLE *table, char *buff, const char* db,
     table->field[i++]->store(column, col_length, cs);
   table->field[i++]->store(priv, priv_length, cs);
   table->field[i]->store(is_grantable, strlen(is_grantable), cs);
-  table->file->write_row(table->record[0]);
+  return schema_table_store_record(thd, table);
 }
 
 
 int fill_schema_user_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
 {
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
+  int error= 0;
   uint counter;
   ACL_USER *acl_user;
   ulong want_access;
@@ -6010,8 +6012,14 @@ int fill_schema_user_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
 
     strxmov(buff,"'",user,"'@'",host,"'",NullS);
     if (!(want_access & ~GRANT_ACL))
-      update_schema_privilege(table, buff, 0, 0, 0, 0,
-                              STRING_WITH_LEN("USAGE"), is_grantable);
+    {
+      if (update_schema_privilege(thd, table, buff, 0, 0, 0, 0,
+                                  STRING_WITH_LEN("USAGE"), is_grantable))
+      {
+        error= 1;
+        goto err;
+      }
+    }
     else
     {
       uint priv_id;
@@ -6019,16 +6027,22 @@ int fill_schema_user_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
       for (priv_id=0, j = SELECT_ACL;j <= GLOBAL_ACLS; priv_id++,j <<= 1)
       {
 	if (test_access & j)
-          update_schema_privilege(table, buff, 0, 0, 0, 0, 
-                                  command_array[priv_id],
-                                  command_lengths[priv_id], is_grantable);
+        {
+          if (update_schema_privilege(thd, table, buff, 0, 0, 0, 0, 
+                                      command_array[priv_id],
+                                      command_lengths[priv_id], is_grantable))
+          {
+            error= 1;
+            goto err;
+          }
+        }
       }
     }
   }
-
+err:
   pthread_mutex_unlock(&acl_cache->lock);
 
-  DBUG_RETURN(0);
+  DBUG_RETURN(error);
 #else
   return(0);
 #endif
@@ -6038,6 +6052,7 @@ int fill_schema_user_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
 int fill_schema_schema_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
 {
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
+  int error= 0;
   uint counter;
   ACL_DB *acl_db;
   ulong want_access;
@@ -6075,24 +6090,36 @@ int fill_schema_schema_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
       }
       strxmov(buff,"'",user,"'@'",host,"'",NullS);
       if (!(want_access & ~GRANT_ACL))
-        update_schema_privilege(table, buff, acl_db->db, 0, 0,
-                                0, STRING_WITH_LEN("USAGE"), is_grantable);
+      {
+        if (update_schema_privilege(thd, table, buff, acl_db->db, 0, 0,
+                                    0, STRING_WITH_LEN("USAGE"), is_grantable))
+        {
+          error= 1;
+          goto err;
+        }
+      }
       else
       {
         int cnt;
         ulong j,test_access= want_access & ~GRANT_ACL;
         for (cnt=0, j = SELECT_ACL; j <= DB_ACLS; cnt++,j <<= 1)
           if (test_access & j)
-            update_schema_privilege(table, buff, acl_db->db, 0, 0, 0,
-                                    command_array[cnt], command_lengths[cnt],
-                                    is_grantable);
+          {
+            if (update_schema_privilege(thd, table, buff, acl_db->db, 0, 0, 0,
+                                        command_array[cnt], command_lengths[cnt],
+                                        is_grantable))
+            {
+              error= 1;
+              goto err;
+            }
+          }
       }
     }
   }
-
+err:
   pthread_mutex_unlock(&acl_cache->lock);
 
-  DBUG_RETURN(0);
+  DBUG_RETURN(error);
 #else
   return (0);
 #endif
@@ -6102,6 +6129,7 @@ int fill_schema_schema_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
 int fill_schema_table_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
 {
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
+  int error= 0;
   uint index;
   char buff[100];
   TABLE *table= tables->table;
@@ -6141,8 +6169,15 @@ int fill_schema_table_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
 
       strxmov(buff, "'", user, "'@'", host, "'", NullS);
       if (!test_access)
-        update_schema_privilege(table, buff, grant_table->db, grant_table->tname,
-                                0, 0, STRING_WITH_LEN("USAGE"), is_grantable);
+      {
+        if (update_schema_privilege(thd, table, buff, grant_table->db,
+                                    grant_table->tname, 0, 0,
+                                    STRING_WITH_LEN("USAGE"), is_grantable))
+        {
+          error= 1;
+          goto err;
+        }
+      }
       else
       {
         ulong j;
@@ -6150,17 +6185,24 @@ int fill_schema_table_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
         for (cnt= 0, j= SELECT_ACL; j <= TABLE_ACLS; cnt++, j<<= 1)
         {
           if (test_access & j)
-            update_schema_privilege(table, buff, grant_table->db, 
-                                    grant_table->tname, 0, 0, command_array[cnt],
-                                    command_lengths[cnt], is_grantable);
+          {
+            if (update_schema_privilege(thd, table, buff, grant_table->db,
+                                        grant_table->tname, 0, 0,
+                                        command_array[cnt],
+                                        command_lengths[cnt], is_grantable))
+            {
+              error= 1;
+              goto err;
+            }
+          }
         }
       }
-    }
+    }   
   }
-
+err:
   rw_unlock(&LOCK_grant);
 
-  DBUG_RETURN(0);
+  DBUG_RETURN(error);
 #else
   return (0);
 #endif
@@ -6170,6 +6212,7 @@ int fill_schema_table_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
 int fill_schema_column_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
 {
 #ifndef NO_EMBEDDED_ACCESS_CHECKS
+  int error= 0;
   uint index;
   char buff[100];
   TABLE *table= tables->table;
@@ -6219,22 +6262,28 @@ int fill_schema_column_privileges(THD *thd, TABLE_LIST *tables, COND *cond)
               GRANT_COLUMN *grant_column = (GRANT_COLUMN*)
                 hash_element(&grant_table->hash_columns,col_index);
               if ((grant_column->rights & j) && (table_access & j))
-                  update_schema_privilege(table, buff, grant_table->db,
-                                          grant_table->tname,
-                                          grant_column->column,
-                                          grant_column->key_length,
-                                          command_array[cnt],
-                                          command_lengths[cnt], is_grantable);
+              {
+                if (update_schema_privilege(thd, table, buff, grant_table->db,
+                                            grant_table->tname,
+                                            grant_column->column,
+                                            grant_column->key_length,
+                                            command_array[cnt],
+                                            command_lengths[cnt], is_grantable))
+                {
+                  error= 1;
+                  goto err;
+                }
+              }
             }
           }
         }
       }
     }
   }
-
+err:
   rw_unlock(&LOCK_grant);
 
-  DBUG_RETURN(0);
+  DBUG_RETURN(error);
 #else
   return (0);
 #endif
diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index 59082e0a295..c10580e8913 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -44,7 +44,7 @@ static void
 append_algorithm(TABLE_LIST *table, String *buff);
 static int
 view_store_create_info(THD *thd, TABLE_LIST *table, String *buff);
-static bool schema_table_store_record(THD *thd, TABLE *table);
+bool schema_table_store_record(THD *thd, TABLE *table);
 
 
 /***************************************************************************
@@ -1884,7 +1884,7 @@ typedef struct st_index_field_values
     1	                  error
 */
 
-static bool schema_table_store_record(THD *thd, TABLE *table)
+bool schema_table_store_record(THD *thd, TABLE *table)
 {
   int error;
   if ((error= table->file->write_row(table->record[0])))