Deprecate Doctrine\DBAL\Types\Type::getDefaultLength()

UPGRADE.md

 # Upgrade to 2.9
 
+## Deprecated `Doctrine\DBAL\Types\Type::getDefaultLength()`
+
+This method was never used by DBAL internally. It is now deprecated and will be removed in DBAL 3.0.
+
 ## Deprecated `Doctrine\DBAL\Types\Type::__toString()`
 
 Relying on string representation is discouraged and will be removed in DBAL 3.0.

lib/Doctrine/DBAL/Types/Type.php

@@ -146,7 +146,7 @@ abstract class Type
      *
      * @return int|null
      *
-     * @todo Needed?
+     * @deprecated Rely on information provided by the platform instead.
      */
     public function getDefaultLength(AbstractPlatform $platform)
     {