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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2021 Robin Appelman <robin@icewind.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Files\Search\QueryOptimizer;
use OCP\Files\Search\ISearchBinaryOperator;
use OCP\Files\Search\ISearchComparison;
use OCP\Files\Search\ISearchOperator;
class PathPrefixOptimizer extends QueryOptimizerStep {
public function escapeLikeParameter(string $param): string {
return addcslashes($param, '\\_%');
}
public function processOperator(ISearchOperator &$operator) {
// normally the `path = "$prefix"` search query part of the prefix filter would be generated as an `path_hash = md5($prefix)` sql query
// since the `path_hash` sql column usually provides much faster querying that selecting on the `path` sql column
//
// however, since we're already doing a filter on the `path` column in the form of `path LIKE "$prefix/%"`
// generating a `path = "$prefix"` sql query lets the database handle use the same column for both expressions and potentially use the same index
if ($operator instanceof ISearchBinaryOperator && $operator->getType() === ISearchBinaryOperator::OPERATOR_OR && count($operator->getArguments()) == 2) {
$a = $operator->getArguments()[0];
$b = $operator->getArguments()[1];
if ($a instanceof ISearchComparison && $b instanceof ISearchComparison && $a->getField() === 'path' && $b->getField() === 'path') {
if ($a->getType() === ISearchComparison::COMPARE_LIKE_CASE_SENSITIVE && $b->getType() === ISearchComparison::COMPARE_EQUAL
&& $a->getValue() === $this->escapeLikeParameter($b->getValue()) . '/%') {
$b->setQueryHint(ISearchComparison::HINT_PATH_EQ_HASH, false);
}
if ($b->getType() === ISearchComparison::COMPARE_LIKE_CASE_SENSITIVE && $a->getType() === ISearchComparison::COMPARE_EQUAL
&& $b->getValue() === $this->escapeLikeParameter($a->getValue()) . '/%') {
$a->setQueryHint(ISearchComparison::HINT_PATH_EQ_HASH, false);
}
}
}
parent::processOperator($operator);
}
}
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