dujl commented on code in PR #10402: URL: https://github.com/apache/doris/pull/10402#discussion_r908124893
########## be/src/vec/exec/file_text_scanner.cpp: ########## @@ -0,0 +1,308 @@ +// 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 "vec/exec/file_text_scanner.h" + +#include <fmt/format.h> +#include <gen_cpp/internal_service.pb.h> + +#include <iostream> + +#include "exec/exec_node.h" +#include "exec/plain_text_line_reader.h" +#include "exec/text_converter.h" +#include "exec/text_converter.hpp" +#include "exprs/expr_context.h" +#include "io/buffered_reader.h" +#include "io/hdfs_reader_writer.h" +#include "util/types.h" +#include "util/utf8_check.h" + +namespace doris::vectorized { + +FileTextScanner::FileTextScanner(RuntimeState* state, RuntimeProfile* profile, + const TFileScanRangeParams& params, + const std::vector<TFileRangeDesc>& ranges, + const std::vector<TExpr>& pre_filter_texprs, + ScannerCounter* counter) + : FileScanner(state, profile, params, ranges, pre_filter_texprs, counter), + _cur_file_reader(nullptr), + _cur_line_reader(nullptr), + _cur_line_reader_eof(false), + _skip_lines(0), + _success(false) + +{ + if (params.__isset.text_params) { + auto text_params = params.text_params; + if (text_params.__isset.column_separator_length && + text_params.column_separator_length > 1) { + _value_separator = text_params.column_separator_str; + _value_separator_length = text_params.column_separator_length; + } else { + _value_separator.push_back(static_cast<char>(text_params.column_separator)); + _value_separator_length = 1; + } + if (text_params.__isset.line_delimiter_length && text_params.line_delimiter_length > 1) { + _line_delimiter = text_params.line_delimiter_str; + _line_delimiter_length = text_params.line_delimiter_length; + } else { + _line_delimiter.push_back(static_cast<char>(text_params.line_delimiter)); + _line_delimiter_length = 1; + } + } +} + +FileTextScanner::~FileTextScanner() { + close(); +} + +Status FileTextScanner::open() { + RETURN_IF_ERROR(FileScanner::open()); + + if (_ranges.empty()) { + return Status::OK(); + } + _split_values.reserve(sizeof(Slice) * _file_slot_descs.size()); + return Status::OK(); +} + +void FileTextScanner::close() { + FileScanner::close(); + + if (_cur_line_reader != nullptr) { + delete _cur_line_reader; + _cur_line_reader = nullptr; + } +} + +Status FileTextScanner::get_next(Block* block, bool* eof) { + SCOPED_TIMER(_read_timer); + RETURN_IF_ERROR(init_block(block)); + + const int batch_size = _state->batch_size(); + + while (_rows < batch_size && !_scanner_eof) { + if (_cur_line_reader == nullptr || _cur_line_reader_eof) { + RETURN_IF_ERROR(_open_next_reader()); + // If there isn't any more reader, break this + if (_scanner_eof) { + continue; + } + } + const uint8_t* ptr = nullptr; + size_t size = 0; + RETURN_IF_ERROR(_cur_line_reader->read_line(&ptr, &size, &_cur_line_reader_eof)); + std::unique_ptr<const uint8_t> u_ptr; + u_ptr.reset(ptr); + if (_skip_lines > 0) { + _skip_lines--; + continue; + } + if (size == 0) { + // Read empty row, just continue + continue; + } + { + COUNTER_UPDATE(_rows_read_counter, 1); + RETURN_IF_ERROR(_fill_file_columns(Slice(ptr, size), block)); + } + } + + return fill_block(block, eof); +} + +Status FileTextScanner::_fill_file_columns(const Slice& line, vectorized::Block* _block) { + RETURN_IF_ERROR(_line_split_to_values(line)); + if (!_success) { + // If not success, which means we met an invalid row, return. + return Status::OK(); + } + + for (int i = 0; i < _split_values.size(); ++i) { + auto slot_desc = _file_slot_descs[i]; + const Slice& value = _split_values[i]; + + auto doris_column = _block->get_by_name(slot_desc->col_name()).column; + IColumn* col_ptr = const_cast<IColumn*>(doris_column.get()); + if (slot_desc->is_nullable()) { + auto* nullable_column = reinterpret_cast<vectorized::ColumnNullable*>(col_ptr); + nullable_column->get_null_map_data().push_back(0); + col_ptr = &nullable_column->get_nested_column(); + } + + if (value.size == 2 && value.data[0] == '\\' && value[1] == 'N') { + col_ptr->insert_default(); + continue; + } + _text_converter->write_vec_column(slot_desc, col_ptr, value.data, value.size, true, false); + } + _rows++; + return Status::OK(); +} + +Status FileTextScanner::_open_next_reader() { + if (_next_range >= _ranges.size()) { + _scanner_eof = true; + return Status::OK(); + } + + RETURN_IF_ERROR(_open_file_reader()); + RETURN_IF_ERROR(_open_line_reader()); + _next_range++; + + return Status::OK(); +} + +Status FileTextScanner::_open_file_reader() { + const TFileRangeDesc& range = _ranges[_next_range]; + + FileReader* hdfs_reader = nullptr; + RETURN_IF_ERROR(HdfsReaderWriter::create_reader(range.hdfs_params, range.path, + range.start_offset, &hdfs_reader)); + _cur_file_reader.reset(new BufferedReader(_profile, hdfs_reader)); + return _cur_file_reader->open(); +} + +Status FileTextScanner::_open_line_reader() { + if (_cur_line_reader != nullptr) { + delete _cur_line_reader; + _cur_line_reader = nullptr; + } + + const TFileRangeDesc& range = _ranges[_next_range]; + int64_t size = range.size; + if (range.start_offset != 0) { + if (range.format_type != TFileFormatType::FORMAT_CSV_PLAIN) { + std::stringstream ss; + ss << "For now we do not support split compressed file"; + return Status::InternalError(ss.str()); + } + size += 1; + // not first range will always skip one line + _skip_lines = 1; + } + + // open line reader + switch (range.format_type) { + case TFileFormatType::FORMAT_CSV_PLAIN: + _cur_line_reader = new PlainTextLineReader(_profile, _cur_file_reader.get(), nullptr, size, Review Comment: do we support compressed csv file? -- This is an automated message from the Apache Git Service. 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