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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2021 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OC\Files\Search\QueryOptimizer;
use OC\Files\Search\SearchComparison;
use OCP\Files\Search\ISearchBinaryOperator;
use OCP\Files\Search\ISearchComparison;
use OCP\Files\Search\ISearchOperator;
class PathPrefixOptimizer extends QueryOptimizerStep {
private bool $useHashEq = true;
public function inspectOperator(ISearchOperator $operator): void {
// normally any `path = "$path"` search filter would be generated as an `path_hash = md5($path)` sql query
// since the `path_hash` sql column usually provides much faster querying that selecting on the `path` sql column
//
// however, if we're already doing a filter on the `path` column in the form of `path LIKE "$prefix/%"`
// generating a `path = "$prefix"` sql query lets the database handle use the same column for both expressions and potentially use the same index
//
// If there is any operator in the query that matches this pattern, we change all `path = "$path"` instances to not the `path_hash` equality,
// otherwise mariadb has a tendency of ignoring the path_prefix index
if ($this->useHashEq && $this->isPathPrefixOperator($operator)) {
$this->useHashEq = false;
}
parent::inspectOperator($operator);
}
public function processOperator(ISearchOperator &$operator) {
if (!$this->useHashEq && $operator instanceof ISearchComparison && !$operator->getExtra() && $operator->getField() === 'path' && $operator->getType() === ISearchComparison::COMPARE_EQUAL) {
$operator->setQueryHint(ISearchComparison::HINT_PATH_EQ_HASH, false);
}
parent::processOperator($operator);
}
private function isPathPrefixOperator(ISearchOperator $operator): bool {
if ($operator instanceof ISearchBinaryOperator && $operator->getType() === ISearchBinaryOperator::OPERATOR_OR && count($operator->getArguments()) == 2) {
$a = $operator->getArguments()[0];
$b = $operator->getArguments()[1];
if ($this->operatorPairIsPathPrefix($a, $b) || $this->operatorPairIsPathPrefix($b, $a)) {
return true;
}
}
return false;
}
private function operatorPairIsPathPrefix(ISearchOperator $like, ISearchOperator $equal): bool {
return (
$like instanceof ISearchComparison && $equal instanceof ISearchComparison &&
!$like->getExtra() && !$equal->getExtra() && $like->getField() === 'path' && $equal->getField() === 'path' &&
$like->getType() === ISearchComparison::COMPARE_LIKE_CASE_SENSITIVE && $equal->getType() === ISearchComparison::COMPARE_EQUAL
&& $like->getValue() === SearchComparison::escapeLikeParameter($equal->getValue()) . '/%'
);
}
}
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