| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| **/ |
| |
| #include "query_optimizer/expressions/SearchedCase.hpp" |
| |
| #include <cstddef> |
| #include <memory> |
| #include <string> |
| #include <utility> |
| #include <vector> |
| |
| #include "expressions/predicate/Predicate.hpp" |
| #include "expressions/scalar/ScalarCaseExpression.hpp" |
| #include "expressions/scalar/ScalarLiteral.hpp" |
| #include "query_optimizer/OptimizerTree.hpp" |
| #include "query_optimizer/expressions/AttributeReference.hpp" |
| #include "query_optimizer/expressions/Expression.hpp" |
| #include "query_optimizer/expressions/Predicate.hpp" |
| #include "query_optimizer/expressions/Scalar.hpp" |
| #include "types/Type.hpp" |
| #include "utility/Cast.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| namespace optimizer { |
| namespace expressions { |
| |
| bool SearchedCase::isConstant() const { |
| // We treat a SearchedCase as constant only if all operands are constant. |
| for (const PredicatePtr &condition_predicate : condition_predicates_) { |
| if (!condition_predicate->isConstant()) { |
| return false; |
| } |
| } |
| for (const ScalarPtr &conditional_result_expression : conditional_result_expressions_) { |
| if (!conditional_result_expression->isConstant()) { |
| return false; |
| } |
| } |
| return (else_result_expression_ == nullptr || else_result_expression_->isConstant()); |
| } |
| |
| std::vector<AttributeReferencePtr> SearchedCase::getReferencedAttributes() const { |
| std::vector<AttributeReferencePtr> referenced_attributes; |
| for (const PredicatePtr &condition_predicate : condition_predicates_) { |
| const std::vector<AttributeReferencePtr> referenced_attributes_in_condition_predicate = |
| condition_predicate->getReferencedAttributes(); |
| referenced_attributes.insert(referenced_attributes.end(), |
| referenced_attributes_in_condition_predicate.begin(), |
| referenced_attributes_in_condition_predicate.end()); |
| } |
| for (const ScalarPtr &conditional_result_expression : conditional_result_expressions_) { |
| const std::vector<AttributeReferencePtr> referenced_attributes_in_conditional_result_expression = |
| conditional_result_expression->getReferencedAttributes(); |
| referenced_attributes.insert(referenced_attributes.end(), |
| referenced_attributes_in_conditional_result_expression.begin(), |
| referenced_attributes_in_conditional_result_expression.end()); |
| } |
| if (else_result_expression_ != nullptr) { |
| const std::vector<AttributeReferencePtr> referenced_attributes_in_else_result_expression = |
| else_result_expression_->getReferencedAttributes(); |
| referenced_attributes.insert(referenced_attributes.end(), |
| referenced_attributes_in_else_result_expression.begin(), |
| referenced_attributes_in_else_result_expression.end()); |
| } |
| return referenced_attributes; |
| } |
| |
| ExpressionPtr SearchedCase::copyWithNewChildren( |
| const std::vector<ExpressionPtr> &new_children) const { |
| DCHECK_EQ(getNumChildren(), new_children.size()); |
| |
| std::vector<PredicatePtr> new_condition_predicates; |
| std::vector<ScalarPtr> new_conditional_result_expressions; |
| ScalarPtr new_else_result_expression; |
| |
| new_condition_predicates.reserve(condition_predicates_.size()); |
| new_conditional_result_expressions.reserve(condition_predicates_.size()); |
| |
| std::size_t num_when_clauses = condition_predicates_.size(); |
| for (std::size_t index = 0; index < num_when_clauses; ++index) { |
| new_condition_predicates.push_back( |
| std::static_pointer_cast<const Predicate>(new_children[index])); |
| |
| new_conditional_result_expressions.push_back( |
| std::static_pointer_cast<const Scalar>(new_children[index + num_when_clauses])); |
| } |
| if (else_result_expression_ != nullptr) { |
| new_else_result_expression = |
| std::static_pointer_cast<const Scalar>(new_children.back()); |
| } |
| |
| return Create(new_condition_predicates, |
| new_conditional_result_expressions, |
| new_else_result_expression, value_type_); |
| } |
| |
| ::quickstep::Scalar* SearchedCase::concretize( |
| const std::unordered_map<ExprId, const CatalogAttribute*> &substitution_map) const { |
| std::vector<std::unique_ptr<quickstep::Predicate>> when_predicates; |
| for (const PredicatePtr &predicate : condition_predicates_) { |
| when_predicates.emplace_back(predicate->concretize(substitution_map)); |
| } |
| |
| std::vector<std::unique_ptr<quickstep::Scalar>> result_expressions; |
| for (const ScalarPtr &expression : conditional_result_expressions_) { |
| result_expressions.emplace_back(expression->concretize(substitution_map)); |
| } |
| |
| std::unique_ptr<quickstep::Scalar> else_result_expression; |
| if (else_result_expression_ == nullptr) { |
| else_result_expression.reset( |
| new quickstep::ScalarLiteral(value_type_.makeNullValue(), value_type_)); |
| } else { |
| else_result_expression.reset( |
| else_result_expression_->concretize(substitution_map)); |
| } |
| |
| return new quickstep::ScalarCaseExpression( |
| value_type_, |
| std::move(when_predicates), |
| std::move(result_expressions), |
| else_result_expression_->concretize(substitution_map)); |
| } |
| |
| void SearchedCase::getFieldStringItems( |
| std::vector<std::string> *inline_field_names, |
| std::vector<std::string> *inline_field_values, |
| std::vector<std::string> *non_container_child_field_names, |
| std::vector<OptimizerTreeBaseNodePtr> *non_container_child_fields, |
| std::vector<std::string> *container_child_field_names, |
| std::vector<std::vector<OptimizerTreeBaseNodePtr>> *container_child_fields) const { |
| container_child_field_names->push_back("condition_perdicates"); |
| container_child_fields->push_back( |
| CastSharedPtrVector<OptimizerTreeBase>(condition_predicates_)); |
| |
| container_child_field_names->push_back("conditional_result_expressions"); |
| container_child_fields->push_back( |
| CastSharedPtrVector<OptimizerTreeBase>(conditional_result_expressions_)); |
| |
| if (else_result_expression_ != nullptr) { |
| non_container_child_field_names->push_back("else_result_expression"); |
| non_container_child_fields->push_back(else_result_expression_); |
| } |
| } |
| |
| } // namespace expressions |
| } // namespace optimizer |
| } // namespace quickstep |