/**
* Render FROM clause with using of addotional specifications for index usage
*
* @param string $sql SQL query
* @return string
*/
protected function _renderFrom($sql)
{
$sql = parent::_renderFrom($sql);
// Add index definitions for MySQL optimizer
$replace = array();
foreach ($this->_parts[self::FROM] as $correlationName => $table) {
if (!isset($this->_parts[self::INDEX][$correlationName]) || !isset($this->_indexSqlTypes[$this->_parts[self::INDEX][$correlationName]['type']])) {
continue;
}
$indexInstruction = $this->_parts[self::INDEX][$correlationName];
$replace['from'][] = $this->_getQuotedTable($table['tableName'], $correlationName);
$replace['to'][] = $this->_getQuotedTable($table['tableName'], $correlationName) . ' ' . sprintf($this->_indexSqlTypes[$indexInstruction['type']], implode(',', array_map(array($this->_adapter, 'quoteIdentifier'), $indexInstruction['indexes'])));
}
if ($replace) {
$sql = str_replace($replace['from'], $replace['to'], $sql);
}
return $sql;
}
