Column.php

<?php
class ZendDbSchema_Db_Schema_Table_DefinitionManager_Column
    extends ZendDbSchema_Db_Schema_Table_DefinitionManager_AbstractManager
{
    protected function _getItemClass()
    {
        return $this->_table->getColumnClass();
    }

    protected function _getSchemaKey()
    {
        return ZendDbSchema_Db_Schema_Table::COLUMNS_KEY;
    }
}