code: public function addDefaultValue($name, $table, $column, $value)
      {
          $sql = $this->db->getQueryBuilder()->addDefaultValue($name, $table, $column, $value);
  
          return $this->setSql($sql)->requireTableSchemaRefresh($table);
      }
docs: Creates a SQL command for adding a default value constraint to an existing table.
  @param string $name the name of the default value constraint.
  The name will be properly quoted by the method.
  @param string $table the table that the default value constraint will be added to.
  The name will be properly quoted by the method.
  @param string $column the name of the column to that the constraint will be added on.
  The name will be properly quoted by the method.
  @param mixed $value default value.
  @return $this the command object itself.
  @since 2.0.13