ee5323a6a0
When constructing `Schema` objects, two similar `init` functions need to be called, and the call order is implicitly required, which is easy to be misused. At the same time, some of the existing comments are missing or out of date, which will cause some misleading. This patch unifies the initialization logic of `Schema`. No functional changes in this patch.
109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include "olap/schema.h"
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#include "olap/row_block2.h"
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namespace doris {
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Schema::Schema(const Schema& other) {
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_copy_from(other);
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}
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Schema& Schema::operator=(const Schema& other) {
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if (this != &other) {
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_copy_from(other);
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}
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return *this;
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}
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void Schema::_copy_from(const Schema& other) {
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_col_ids = other._col_ids;
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_col_offsets = other._col_offsets;
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_num_key_columns = other._num_key_columns;
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_schema_size = other._schema_size;
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// Deep copy _cols
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// TODO(lingbin): really need clone?
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_cols.resize(other._cols.size(), nullptr);
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for (auto cid : _col_ids) {
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_cols[cid] = other._cols[cid]->clone();
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}
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}
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void Schema::_init(const std::vector<TabletColumn>& cols,
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const std::vector<ColumnId>& col_ids,
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size_t num_key_columns) {
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_col_ids = col_ids;
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_num_key_columns = num_key_columns;
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_cols.resize(cols.size(), nullptr);
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_col_offsets.resize(_cols.size(), -1);
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size_t offset = 0;
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std::unordered_set<uint32_t> col_id_set(col_ids.begin(), col_ids.end());
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for (int cid = 0; cid < cols.size(); ++cid) {
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if (col_id_set.find(cid) == col_id_set.end()) {
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continue;
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}
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_cols[cid] = FieldFactory::create(cols[cid]);
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_col_offsets[cid] = offset;
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// Plus 1 byte for null byte
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offset += _cols[cid]->size() + 1;
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}
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_schema_size = offset;
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}
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void Schema::_init(const std::vector<const Field*>& cols,
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const std::vector<ColumnId>& col_ids,
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size_t num_key_columns) {
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_col_ids = col_ids;
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_num_key_columns = num_key_columns;
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_cols.resize(cols.size(), nullptr);
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_col_offsets.resize(_cols.size(), -1);
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size_t offset = 0;
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std::unordered_set<uint32_t> col_id_set(col_ids.begin(), col_ids.end());
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for (int cid = 0; cid < cols.size(); ++cid) {
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if (col_id_set.find(cid) == col_id_set.end()) {
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continue;
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}
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// TODO(lingbin): is it necessary to clone Field? each SegmentIterator will
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// use this func, can we avoid clone?
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_cols[cid] = cols[cid]->clone();
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_col_offsets[cid] = offset;
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// Plus 1 byte for null byte
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offset += _cols[cid]->size() + 1;
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}
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_schema_size = offset;
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}
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Schema::~Schema() {
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for (auto col : _cols) {
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delete col;
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}
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}
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}
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