| // 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. |
| |
| #ifndef IMPALA_RUNTIME_COLLECTION_VALUE_H |
| #define IMPALA_RUNTIME_COLLECTION_VALUE_H |
| |
| #include "runtime/descriptors.h" |
| |
| namespace impala { |
| |
| /// The in-memory representation of a collection-type slot. Note that both arrays and maps |
| /// are represented in memory as arrays of tuples. After being read from the on-disk data, |
| /// arrays and maps are effectively indistinguishable; a map can be thought of as an array |
| /// of key/value structs (and neither of these fields are necessarily materialized in the |
| /// item tuples). |
| struct __attribute__((__packed__)) CollectionValue { |
| /// Pointer to buffer containing item tuples. |
| uint8_t* ptr; |
| |
| /// The number of item tuples. |
| int num_tuples; |
| |
| CollectionValue() : ptr(NULL), num_tuples(0) {} |
| |
| /// Returns the size of this collection in bytes, i.e. the number of bytes written to |
| /// ptr. |
| inline int64_t ByteSize(const TupleDescriptor& item_tuple_desc) const { |
| return static_cast<int64_t>(num_tuples) * item_tuple_desc.byte_size(); |
| } |
| |
| /// For C++/IR interop, we need to be able to look up types by name. |
| static const char* LLVM_CLASS_NAME; |
| }; |
| |
| } |
| |
| #endif |