/**
* Prepare index select
*
* @param Mage_Core_Model_Website $website
* @param $time
* @return Varien_Db_Select
*/
protected function _prepareIndexSelect(Mage_Core_Model_Website $website, $time)
{
$nA = $this->_connection->quote('N/A');
$this->_connection->query('SET @price := NULL');
$this->_connection->query('SET @group_id := NULL');
$this->_connection->query('SET @action_stop := NULL');
$indexSelect = $this->_connection->select()->from(array('cppt' => $this->_getTemporaryTable()), array())->order(array('cppt.grouped_id', 'cppt.sort_order', 'cppt.rule_product_id'))->columns(array('customer_group_id' => 'cppt.customer_group_id', 'product_id' => 'cppt.product_id', 'rule_price' => $this->_calculatePrice(), 'latest_start_date' => 'cppt.from_date', 'earliest_end_date' => 'cppt.to_date', new Zend_Db_Expr($this->_connection->getCaseSql('', array($this->_connection->getIfNullSql(new Zend_Db_Expr('@group_id'), $nA) . ' != cppt.grouped_id' => new Zend_Db_Expr('@action_stop := cppt.action_stop'), $this->_connection->getIfNullSql(new Zend_Db_Expr('@group_id'), $nA) . ' = cppt.grouped_id' => '@action_stop := ' . $this->_connection->getIfNullSql(new Zend_Db_Expr('@action_stop'), new Zend_Db_Expr(0)) . ' + cppt.action_stop'))), new Zend_Db_Expr('@group_id := cppt.grouped_id'), 'from_time' => 'cppt.from_time', 'to_time' => 'cppt.to_time'));
$select = $this->_connection->select()->from($indexSelect, array())->joinInner(array('dates' => $this->_connection->select()->union(array(new Zend_Db_Expr('SELECT ' . $this->_connection->getDateAddSql($this->_connection->fromUnixtime($time), -1, Varien_Db_Adapter_Interface::INTERVAL_DAY) . ' AS rule_date'), new Zend_Db_Expr('SELECT ' . $this->_connection->fromUnixtime($time) . ' AS rule_date'), new Zend_Db_Expr('SELECT ' . $this->_connection->getDateAddSql($this->_connection->fromUnixtime($time), 1, Varien_Db_Adapter_Interface::INTERVAL_DAY) . ' AS rule_date')))), '1=1', array())->columns(array('rule_product_price_id' => new Zend_Db_Expr('NULL'), 'rule_date' => 'dates.rule_date', 'customer_group_id' => 'customer_group_id', 'product_id' => 'product_id', 'rule_price' => 'MIN(rule_price)', 'website_id' => new Zend_Db_Expr($website->getId()), 'latest_start_date' => 'latest_start_date', 'earliest_end_date' => 'earliest_end_date'))->where(new Zend_Db_Expr($this->_connection->getUnixTimestamp('dates.rule_date') . " >= from_time"))->where($this->_connection->getCheckSql(new Zend_Db_Expr('to_time = 0'), new Zend_Db_Expr(1), new Zend_Db_Expr($this->_connection->getUnixTimestamp('dates.rule_date') . " <= to_time")))->group(array('customer_group_id', 'product_id', 'dates.rule_date'));
return $select;
}