TCA::getColumn() 

\nn\t3::TCA()->getColumn($tableName = '', $fieldName = '', $useSchemaManager = false); 

Gets configuration array for a field from the TCA. Alias to \nn\t3::Db()->getColumn()

\nn\t3::TCA()->getColumn( 'pages', 'media' );

| @return array

public function getColumn( $tableName = '', $fieldName = '', $useSchemaManager = false)
{
	return \nn\t3::Db()->getColumn( $tableName, $fieldName, $useSchemaManager );
}