| // 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 "exprs/expr.h" |
| |
| #include <sstream> |
| #include <thrift/protocol/TDebugProtocol.h> |
| |
| #include "common/object-pool.h" |
| #include "common/status.h" |
| #include "exprs/scalar-expr.h" |
| #include "runtime/lib-cache.h" |
| #include "gen-cpp/Data_types.h" |
| #include "gen-cpp/Exprs_types.h" |
| #include "gen-cpp/ImpalaService_types.h" |
| |
| #include "common/names.h" |
| |
| namespace impala { |
| |
| const char* Expr::LLVM_CLASS_NAME = "class.impala::Expr"; |
| |
| Expr::Expr(const ColumnType& type) |
| : type_(type) { |
| } |
| |
| Expr::Expr(const TExprNode& node) |
| : type_(ColumnType::FromThrift(node.type)) { |
| if (node.__isset.fn) fn_ = node.fn; |
| } |
| |
| Expr::~Expr() { |
| DCHECK(cache_entry_ == nullptr); |
| } |
| |
| Status Expr::CreateTree(const TExpr& texpr, ObjectPool* pool, Expr* root) { |
| DCHECK(!texpr.nodes.empty()); |
| DCHECK(root != nullptr); |
| // The root of the tree at nodes[0] is already created and stored in 'root'. |
| int child_node_idx = 0; |
| int num_children = texpr.nodes[0].num_children; |
| for (int i = 0; i < num_children; ++i) { |
| ++child_node_idx; |
| Status status = CreateTreeInternal(texpr.nodes, pool, root, &child_node_idx); |
| if (UNLIKELY(!status.ok())) { |
| LOG(ERROR) << "Could not construct expr tree.\n" << status.GetDetail() << "\n" |
| << apache::thrift::ThriftDebugString(texpr); |
| return status; |
| } |
| } |
| if (UNLIKELY(child_node_idx + 1 != texpr.nodes.size())) { |
| return Status("Expression tree only partially reconstructed. Not all thrift " \ |
| "nodes were used."); |
| } |
| return Status::OK(); |
| } |
| |
| Status Expr::CreateTreeInternal(const vector<TExprNode>& nodes, ObjectPool* pool, |
| Expr* root, int* child_node_idx) { |
| // propagate error case |
| if (*child_node_idx >= nodes.size()) { |
| return Status("Failed to reconstruct expression tree from thrift."); |
| } |
| |
| const TExprNode& texpr_node = nodes[*child_node_idx]; |
| DCHECK_NE(texpr_node.node_type, TExprNodeType::AGGREGATE_EXPR); |
| ScalarExpr* child_expr; |
| RETURN_IF_ERROR(ScalarExpr::CreateNode(texpr_node, pool, &child_expr)); |
| root->children_.push_back(child_expr); |
| |
| int num_children = nodes[*child_node_idx].num_children; |
| for (int i = 0; i < num_children; ++i) { |
| *child_node_idx += 1; |
| RETURN_IF_ERROR(CreateTreeInternal(nodes, pool, child_expr, child_node_idx)); |
| DCHECK(child_expr->GetChild(i) != nullptr); |
| } |
| return Status::OK(); |
| } |
| |
| void Expr::Close() { |
| for (ScalarExpr* child : children_) child->Close(); |
| if (cache_entry_ != nullptr) { |
| LibCache::instance()->DecrementUseCount(cache_entry_); |
| cache_entry_ = nullptr; |
| } |
| } |
| |
| } |