yiguolei commented on code in PR #65492: URL: https://github.com/apache/doris/pull/65492#discussion_r3645868199
########## be/src/storage/key/row_key_encoder.cpp: ########## @@ -0,0 +1,155 @@ +// 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 "storage/key/row_key_encoder.h" + +#include <cassert> + +#include "common/cast_set.h" +#include "common/compiler_util.h" // IWYU pragma: keep +#include "common/consts.h" +#include "common/logging.h" +#include "storage/iterator/olap_data_convertor.h" +#include "storage/key_coder.h" +#include "storage/tablet/tablet_schema.h" + +namespace doris { + +RowKeyEncoder::RowKeyEncoder(const TabletSchema& schema, bool mow) + : _num_short_key_columns(schema.num_short_key_columns()) { + if (mow) { + _init_mow(schema); + } else { + _init_non_mow(schema); + } +} + +void RowKeyEncoder::_init_mow(const TabletSchema& schema) { + // encode the sequence id into the primary key index + if (schema.has_sequence_col()) { + const auto& column = schema.column(schema.sequence_col_idx()); + _seq_coder = get_key_coder(column.type()); + _seq_col_length = column.length(); + } + + if (schema.cluster_key_uids().empty()) { + _add_default_sort_key_columns(schema); + return; + } + + for (size_t cid = 0; cid < schema.num_key_columns(); ++cid) { + _primary_key_coders.push_back(get_key_coder(schema.column(cid).type())); + } + _rowid_coder = get_key_coder(FieldType::OLAP_FIELD_TYPE_UNSIGNED_INT); + for (auto uid : schema.cluster_key_uids()) { + _add_sort_key_column(schema.column_by_uid(uid)); + } +} + +void RowKeyEncoder::_init_non_mow(const TabletSchema& schema) { + _add_default_sort_key_columns(schema); +} + +void RowKeyEncoder::_add_default_sort_key_columns(const TabletSchema& schema) { + for (size_t cid = 0; cid < schema.num_key_columns(); ++cid) { + _add_sort_key_column(schema.column(cid)); + } +} + +void RowKeyEncoder::_add_sort_key_column(const TabletColumn& column) { + _sort_key_coders.push_back(get_key_coder(column.type())); + _sort_key_index_size.push_back(cast_set<uint16_t>(column.index_length())); +} + +std::string RowKeyEncoder::full_encode(const std::vector<IOlapColumnDataAccessor*>& key_columns, + size_t pos) const { + assert(_sort_key_index_size.size() == _sort_key_coders.size()); + assert(key_columns.size() == _sort_key_coders.size()); + return _full_encode(_sort_key_coders, key_columns, pos); +} + +std::string RowKeyEncoder::full_encode_primary_keys( + const std::vector<IOlapColumnDataAccessor*>& key_columns, size_t pos) const { + return _full_encode(_primary_key_coders, key_columns, pos); +} + +namespace { +// Shared row-key encoding base: for each key column, write a null marker for +// a null value, otherwise a normal marker followed by whatever `encode_field` +// appends. `encode_field(cid, field, out)` is the only thing that differs between +// the full key encode and the short-key prefix encode. +template <typename EncodeField> +std::string encode_key_columns(const std::vector<IOlapColumnDataAccessor*>& key_columns, size_t pos, + EncodeField&& encode_field) { + std::string encoded_keys; + size_t cid = 0; + for (const auto& column : key_columns) { + const auto* field = column->get_data_at(pos); + if (UNLIKELY(!field)) { + encoded_keys.push_back(KeyConsts::KEY_NULL_FIRST_MARKER); + ++cid; + continue; + } + encoded_keys.push_back(KeyConsts::KEY_NORMAL_MARKER); + encode_field(cid, field, &encoded_keys); + ++cid; + } + return encoded_keys; +} +} // namespace + +std::string RowKeyEncoder::_full_encode(const std::vector<const KeyCoder*>& key_coders, + const std::vector<IOlapColumnDataAccessor*>& key_columns, + size_t pos) { + assert(key_columns.size() == key_coders.size()); + return encode_key_columns(key_columns, pos, + [&](size_t cid, const void* field, std::string* out) { + DCHECK(key_coders[cid] != nullptr); + key_coders[cid]->full_encode_ascending(field, out); + }); +} + +std::string RowKeyEncoder::encode_short_keys( + const std::vector<IOlapColumnDataAccessor*>& key_columns, size_t pos) const { + assert(key_columns.size() == _num_short_key_columns); + assert(key_columns.size() <= _sort_key_coders.size()); + return encode_key_columns( + key_columns, pos, [&](size_t cid, const void* field, std::string* out) { + _sort_key_coders[cid]->encode_ascending(field, _sort_key_index_size[cid], out); + }); +} + +void RowKeyEncoder::append_seq_suffix(std::string* encoded_keys, + const IOlapColumnDataAccessor* seq_column, size_t pos) const { + const auto* field = seq_column->get_data_at(pos); + // So the primary key index can still use it, encode a null seq column as + // the smallest value of its length. + if (UNLIKELY(!field)) { + encoded_keys->push_back(KeyConsts::KEY_NULL_FIRST_MARKER); + encoded_keys->append(_seq_col_length, KeyConsts::KEY_MINIMAL_MARKER); + return; + } + encoded_keys->push_back(KeyConsts::KEY_NORMAL_MARKER); + _seq_coder->full_encode_ascending(field, encoded_keys); +} + +void RowKeyEncoder::append_rowid_suffix(std::string* encoded_keys, uint32_t rowid) const { Review Comment: 这种suffix 的作用是啥啊 -- This is an automated message from the Apache Git Service. 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