c5edf9dae0
Currently, we have Field and ColumnSchema to access column data in a row. These two classes are mostly the same. So we should unify these to one class. Now, Field has offset information, which is an row attribute, so we remove offset in Field. RowCursor now has some logic which belong to Schema, so in this patch I add Schema attribute to RowCursor to make RowCursor simple. After this change, only Schema will handle Field/ColumnSchema. I extract some logic from RowCursor to be/src/olap/row.h, then we can use same logic to handle different types of row. Each type of row has same function that to get Cell of this row. A cell represent a column content with a null indicator.
87 lines
2.4 KiB
C++
87 lines
2.4 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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_num_key_columns = other._num_key_columns;
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_col_ids = other._col_ids;
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_col_offsets = other._col_offsets;
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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] = new Field(*other._cols[cid]);
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}
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}
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void Schema::reset(const std::vector<Field>& cols, size_t num_key_columns) {
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std::vector<ColumnId> col_ids(cols.size());
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for (uint32_t cid = 0; cid < cols.size(); ++cid) {
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col_ids[cid] = cid;
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}
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reset(cols, col_ids, num_key_columns);
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}
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void Schema::reset(const std::vector<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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_num_key_columns = num_key_columns;
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_col_ids = col_ids;
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_cols.resize(cols.size(), nullptr);
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_col_offsets.resize(cols.size(), -1);
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// we must make sure that the offset is the same with RowBlock's
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std::unordered_set<uint32_t> column_set(_col_ids.begin(), _col_ids.end());
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size_t offset = 0;
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for (int cid = 0; cid < cols.size(); ++cid) {
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if (column_set.find(cid) == column_set.end()) {
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continue;
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}
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_cols[cid] = new Field(cols[cid]);
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_col_offsets[cid] = offset;
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// 1 for null byte
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offset += _cols[cid]->size() + 1;
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}
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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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