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<?php |
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namespace Doctrine\ORM\Tools\Pagination; |
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use Doctrine\ORM\Query; |
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use Doctrine\ORM\Query\AST\SelectStatement; |
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use Doctrine\ORM\Query\TreeWalkerAdapter; |
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class RemoveUselessLeftJoinsWalker extends TreeWalkerAdapter |
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{ |
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/** |
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* @return void |
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* |
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* @throws \RuntimeException |
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*/ |
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public function walkSelectStatement(SelectStatement $AST) |
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{ |
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$this->removeUnusedJoins($AST); |
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} |
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private function removeUnusedJoins(SelectStatement $AST) |
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{ |
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$from = $AST->fromClause->identificationVariableDeclarations; |
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$fromRoot = reset($from); |
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if (!isset($AST->whereClause) || !isset($AST->whereClause->conditionalExpression)) { |
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return; |
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} |
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$expr = $AST->whereClause->conditionalExpression->simpleConditionalExpression; |
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if (!isset($expr->subselect)) { |
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return; |
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} |
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$subSelect = $expr->subselect; |
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$subSelectUsages = $this->findSubSelectUsages($subSelect); |
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foreach ($subSelect->subselectFromClause->identificationVariableDeclarations as $declaration) { |
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$declaration->joins = $this->filterJoins($declaration->joins, $this->findUnusedJoins($declaration->joins, $subSelectUsages)); |
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} |
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$usages = $this->findSubSelectUsages($AST); |
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$fromRoot->joins = $this->filterJoins($fromRoot->joins, $this->findUnusedJoins($fromRoot->joins, $usages)); |
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} |
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private function findUnusedJoins($joins, $names) |
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{ |
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$unused = []; |
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foreach ($joins as $join) { |
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if (Query\AST\Join::JOIN_TYPE_LEFT === $join->joinType && !in_array($join->joinAssociationDeclaration->aliasIdentificationVariable, $names)) { |
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$unused[] = $join; |
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} |
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} |
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return array_unique($unused); |
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} |
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private function filterJoins($joins, $toRemove) |
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{ |
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return array_filter($joins, function (Query\AST\Join $join) use ($toRemove) { |
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return !in_array($join, $toRemove); |
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}); |
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} |
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private function extractIdentificationVariable($expression) |
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{ |
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return $expression->simpleArithmeticExpression->identificationVariable; |
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} |
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private function findSubSelectUsages($select) |
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{ |
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$usages = []; |
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if (isset($select->whereClause)) { |
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if ($select->whereClause->conditionalExpression instanceof Query\AST\ConditionalTerm) { |
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foreach ($select->whereClause->conditionalExpression->conditionalFactors as $factor) { |
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$expr = $factor->simpleConditionalExpression; |
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if ($expr instanceof Query\AST\ComparisonExpression) { |
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$usages[] = $this->extractIdentificationVariable($expr->leftExpression); |
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} else { |
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$usages[] = $this->extractIdentificationVariable($expr->expression); |
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} |
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} |
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} elseif ($select->whereClause->conditionalExpression instanceof Query\AST\ConditionalPrimary) { |
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$usages[] = $this->extractIdentificationVariable($select->whereClause->conditionalExpression->simpleConditionalExpression->expression); |
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} |
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} |
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if (isset($select->orderByClause)) { |
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foreach ($select->orderByClause->orderByItems as $item) { |
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if ($item->expression instanceof Query\AST\OrderByItem) { |
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$usages[] = $item->expression->identificationVariable; |
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} |
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} |
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} |
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$usages = array_unique($usages); |
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return $usages; |
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} |
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} |
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doctrine /
orm
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