Loosen column comparison

Columns don't need to be the same type to be considered equal, as long
as their declarations yield the same SQL.

src/Platforms/AbstractPlatform.php

@@ -2546,10 +2546,6 @@ public function columnsEqual(Column $column1, Column $column2): bool
             return true;
         }
 
-        if ($column1->getComment() !== $column2->getComment()) {
-            return false;
-        }
-
-        return $column1->getType() === $column2->getType();
+        return $column1->getComment() === $column2->getComment();
     }
 }