Bug #17608: String literals lost during INSERT query on FEDERATED table

  The Federated storage engine used Field methods that had arbitrary limits on
  the amount of data they could process, which caused problems with data
  over that limit (4K). By removing those Field methods and just using
  features of the String class, we can avoid this problem.


mysql-test/r/federated.result:
  Add new results
mysql-test/t/federated.test:
  Add new regression test
sql/field.cc:
  Remove unnecessary methods
sql/field.h:
  Remove unnecessary methods
sql/ha_federated.cc:
  Remove use of quote_data, use String::print() to get escaping of strings,
  and don't bother with needs_quotes, just always quote values.

mysql-test/r/federated.result

@@ -1733,6 +1733,19 @@ id	val
 2	0
 drop table t1;
 drop table t1;
+create table t1 (a longblob not null);
+create table t1
+(a longblob not null) engine=federated
+connection='mysql://root@127.0.0.1:SLAVE_PORT/test/t1';
+insert into t1 values (repeat('a',5000));
+select length(a) from t1;
+length(a)
+5000
+select length(a) from t1;
+length(a)
+5000
+drop table t1;
+drop table t1;
 DROP TABLE IF EXISTS federated.t1;
 DROP DATABASE IF EXISTS federated;
 DROP TABLE IF EXISTS federated.t1;

mysql-test/t/federated.test

@@ -1425,4 +1425,22 @@ drop table t1;
 connection master;
 drop table t1;
 
+#
+# Bug #17608: String literals lost during INSERT query on FEDERATED table
+#
+connection slave;
+create table t1 (a longblob not null);
+connection master;
+--replace_result $SLAVE_MYPORT SLAVE_PORT
+eval create table t1
+  (a longblob not null) engine=federated
+  connection='mysql://root@127.0.0.1:$SLAVE_MYPORT/test/t1';
+insert into t1 values (repeat('a',5000));
+select length(a) from t1;
+connection slave;
+select length(a) from t1;
+drop table t1;
+connection master;
+drop table t1;
+
 source include/federated_cleanup.inc;

sql/field.cc

@@ -1551,104 +1551,6 @@ Field *Field::new_key_field(MEM_ROOT *root, struct st_table *new_table,
 }
 
 
-/* 
-  SYNOPSIS
-  Field::quote_data()
-     unquoted_string    Pointer pointing to the value of a field
-
-  DESCRIPTION
-    Simple method that passes the field type to the method "type_quote"
-    To get a true/false value as to whether the value in string1 needs 
-    to be enclosed with quotes. This ensures that values in the final 
-    sql statement to be passed to the remote server will be quoted properly
-
-  RETURN_VALUE
-    void      Immediately - if string doesn't need quote
-    void      Upon prepending/appending quotes on each side of variable
-
-*/
-
-bool Field::quote_data(String *unquoted_string)
-{
-  char escaped_string[IO_SIZE];
-  DBUG_ENTER("Field::quote_data");
-
-  if (!needs_quotes())
-    DBUG_RETURN(0);
-
-  // this is the same call that mysql_real_escape_string() calls
-  if (escape_string_for_mysql(&my_charset_bin, (char *)escaped_string,
-                              sizeof(escaped_string), unquoted_string->ptr(),
-                              unquoted_string->length()) == (ulong)~0)
-    DBUG_RETURN(1);
-
-  // reset string, then re-append with quotes and escaped values
-  unquoted_string->length(0);
-  if (unquoted_string->append('\'') ||
-      unquoted_string->append((char *)escaped_string) ||
-      unquoted_string->append('\''))
-    DBUG_RETURN(1);
-  DBUG_RETURN(0);
-}
-
-
-/*
-  Quote a field type if needed
-
-  SYNOPSIS
-    Field::type_quote
-
-  DESCRIPTION 
-    Simple method to give true/false whether a field should be quoted. 
-    Used when constructing INSERT and UPDATE queries to the remote server
-    see write_row and update_row
-
-   RETURN VALUE
-      0   if value is of type NOT needing quotes
-      1   if value is of type needing quotes
-*/
-
-bool Field::needs_quotes(void)
-{
-  DBUG_ENTER("Field::type_quote");
-
-  switch (type()) {
-    //FIX this when kernel is fixed
-  case MYSQL_TYPE_VARCHAR :
-  case FIELD_TYPE_STRING :
-  case FIELD_TYPE_VAR_STRING :
-  case FIELD_TYPE_YEAR :
-  case FIELD_TYPE_NEWDATE :
-  case FIELD_TYPE_TIME :
-  case FIELD_TYPE_TIMESTAMP :
-  case FIELD_TYPE_DATE :
-  case FIELD_TYPE_DATETIME :
-  case FIELD_TYPE_TINY_BLOB :
-  case FIELD_TYPE_BLOB :
-  case FIELD_TYPE_MEDIUM_BLOB :
-  case FIELD_TYPE_LONG_BLOB :
-  case FIELD_TYPE_GEOMETRY :
-  case FIELD_TYPE_BIT:
-    DBUG_RETURN(1);
-
-  case FIELD_TYPE_DECIMAL : 
-  case FIELD_TYPE_TINY :
-  case FIELD_TYPE_SHORT :
-  case FIELD_TYPE_INT24 :
-  case FIELD_TYPE_LONG :
-  case FIELD_TYPE_FLOAT :
-  case FIELD_TYPE_DOUBLE :
-  case FIELD_TYPE_LONGLONG :
-  case FIELD_TYPE_NULL :
-  case FIELD_TYPE_SET :
-  case FIELD_TYPE_ENUM : 
-    DBUG_RETURN(0);
-  default:
-    DBUG_RETURN(0);
-  }
-}
-
-
 /****************************************************************************
   Field_null, a field that always return NULL
 ****************************************************************************/

sql/field.h

@@ -251,8 +251,6 @@ public:
     ptr= old_ptr;
     return str;
   }
-  bool quote_data(String *unquoted_string);
-  bool needs_quotes(void);
   virtual bool send_binary(Protocol *protocol);
   virtual char *pack(char* to, const char *from, uint max_length=~(uint) 0)
   {

sql/ha_federated.cc

@@ -124,11 +124,6 @@
 
     ha_federated::write_row
 
-    <for every field/column>
-    Field::quote_data
-    Field::quote_data
-    </for every field/column>
-
     ha_federated::reset
 
     (UPDATE)
@@ -138,20 +133,10 @@
     ha_federated::index_init
     ha_federated::index_read
     ha_federated::index_read_idx
-    Field::quote_data
     ha_federated::rnd_next
     ha_federated::convert_row_to_internal_format
     ha_federated::update_row
 
-    <quote 3 cols, new and old data>
-    Field::quote_data
-    Field::quote_data
-    Field::quote_data
-    Field::quote_data
-    Field::quote_data
-    Field::quote_data
-    </quote 3 cols, new and old data>
-
     ha_federated::extra
     ha_federated::extra
     ha_federated::extra
@@ -1151,7 +1136,7 @@ bool ha_federated::create_where_from_key(String *to,
       Field *field= key_part->field;
       uint store_length= key_part->store_length;
       uint part_length= min(store_length, length);
-      needs_quotes= field->needs_quotes();
+      needs_quotes= 1;
       DBUG_DUMP("key, start of loop", (char *) ptr, length);
 
       if (key_part->null_bit)
@@ -1641,20 +1626,21 @@ int ha_federated::write_row(byte *buf)
       */
       has_fields= TRUE;
 
+      /* append the field name */
+      insert_string.append((*field)->field_name);
+
+      /* append the field value */
       if ((*field)->is_null())
-        insert_field_value_string.append(FEDERATED_NULL);
+        values_string.append(FEDERATED_NULL);
       else
       {
         (*field)->val_str(&insert_field_value_string);
-        /* quote these fields if they require it */
-        (*field)->quote_data(&insert_field_value_string);
-      }
-      /* append the field name */
-      insert_string.append((*field)->field_name);
+        values_string.append('\'');
+        insert_field_value_string.print(&values_string);
+        values_string.append('\'');
 
-      /* append the value */
-      values_string.append(insert_field_value_string);
-      insert_field_value_string.length(0);
+        insert_field_value_string.length(0);
+      }
 
       /* append commas between both fields and fieldnames */
       /*
@@ -1861,8 +1847,9 @@ int ha_federated::update_row(const byte *old_data, byte *new_data)
     {
       /* otherwise = */
       (*field)->val_str(&field_value);
-      (*field)->quote_data(&field_value);
-      update_string.append(field_value);
+      update_string.append('\'');
+      field_value.print(&update_string);
+      update_string.append('\'');
       field_value.length(0);
     }
 
@@ -1873,8 +1860,9 @@ int ha_federated::update_row(const byte *old_data, byte *new_data)
       where_string.append(FEDERATED_EQ);
       (*field)->val_str(&field_value,
                         (char*) (old_data + (*field)->offset()));
-      (*field)->quote_data(&field_value);
-      where_string.append(field_value);
+      where_string.append('\'');
+      field_value.print(&where_string);
+      where_string.append('\'');
       field_value.length(0);
     }
 
@@ -1944,17 +1932,17 @@ int ha_federated::delete_row(const byte *buf)
 
     if (cur_field->is_null())
     {
-      delete_string.append(FEDERATED_IS);
-      data_string.append(FEDERATED_NULL);
+      delete_string.append(FEDERATED_ISNULL);
     }
     else
     {
       delete_string.append(FEDERATED_EQ);
       cur_field->val_str(&data_string);
-      cur_field->quote_data(&data_string);
+      delete_string.append('\'');
+      data_string.print(&delete_string);
+      delete_string.append('\'');
     }
 
-    delete_string.append(data_string);
     delete_string.append(FEDERATED_AND);
   }
   delete_string.length(delete_string.length()-5); // Remove trailing AND