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// Licensed to the Apache Software Foundation (ASF) under one
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// 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
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
#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;