/**
* Retrieve list of columns used for an index or return false, if an index with a given name does not exist
*
* @param string $tableName
* @param string $indexName
* @param string|null $schemaName
* @return array|false
*/
protected function _getIndexColumns($tableName, $indexName, $schemaName = null)
{
foreach ($this->_connection->getIndexList($tableName, $schemaName) as $idxData) {
if ($idxData['KEY_NAME'] == $indexName) {
return $idxData['COLUMNS_LIST'];
}
}
return false;
}