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// 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. #pragma once #include #include #include #include #include #include #include #include "parquet/column_reader.h" #include "parquet/exception.h" #include "parquet/platform.h" #include "parquet/schema.h" #include "parquet/types.h" namespace parquet { static constexpr int64_t DEFAULT_SCANNER_BATCH_SIZE = 128; class PARQUET_EXPORT Scanner { public: explicit Scanner(std::shared_ptr reader, int64_t batch_size = DEFAULT_SCANNER_BATCH_SIZE, ::arrow::MemoryPool* pool = ::arrow::default_memory_pool()) : batch_size_(batch_size), level_offset_(0), levels_buffered_(0), value_buffer_(AllocateBuffer(pool)), value_offset_(0), values_buffered_(0), reader_(std::move(reader)) { def_levels_.resize( descr()->max_definition_level() > 0 ? static_cast(batch_size_) : 0); rep_levels_.resize( descr()->max_repetition_level() > 0 ? static_cast(batch_size_) : 0); } virtual ~Scanner() {} static std::shared_ptr Make( std::shared_ptr col_reader, int64_t batch_size = DEFAULT_SCANNER_BATCH_SIZE, ::arrow::MemoryPool* pool = ::arrow::default_memory_pool()); virtual void PrintNext(std::ostream& out, int width, bool with_levels = false) = 0; bool HasNext() { return level_offset_ < levels_buffered_ || reader_->HasNext(); } const ColumnDescriptor* descr() const { return reader_->descr(); } int64_t batch_size() const { return batch_size_; } void SetBatchSize(int64_t batch_size) { batch_size_ = batch_size; } protected: int64_t batch_size_; std::vector def_levels_; std::vector rep_levels_; int level_offset_; int levels_buffered_; std::shared_ptr value_buffer_; int value_offset_; int64_t values_buffered_; std::shared_ptr reader_; }; template class PARQUET_TEMPLATE_CLASS_EXPORT TypedScanner : public Scanner { public: typedef typename DType::c_type T; explicit TypedScanner(std::shared_ptr reader, int64_t batch_size = DEFAULT_SCANNER_BATCH_SIZE, ::arrow::MemoryPool* pool = ::arrow::default_memory_pool()) : Scanner(std::move(reader), batch_size, pool) { typed_reader_ = static_cast*>(reader_.get()); int value_byte_size = type_traits::value_byte_size; PARQUET_THROW_NOT_OK(value_buffer_->Resize(batch_size_ * value_byte_size)); values_ = reinterpret_cast(value_buffer_->mutable_data()); } virtual ~TypedScanner() {} bool NextLevels(int16_t* def_level, int16_t* rep_level) { if (level_offset_ == levels_buffered_) { levels_buffered_ = static_cast( typed_reader_->ReadBatch(static_cast(batch_size_), def_levels_.data(), rep_levels_.data(), values_, &values_buffered_)); value_offset_ = 0; level_offset_ = 0; if (!levels_buffered_) { return false; } } *def_level = descr()->max_definition_level() > 0 ? def_levels_[level_offset_] : 0; *rep_level = descr()->max_repetition_level() > 0 ? rep_levels_[level_offset_] : 0; level_offset_++; return true; } bool Next(T* val, int16_t* def_level, int16_t* rep_level, bool* is_null) { if (level_offset_ == levels_buffered_) { if (!HasNext()) { // Out of data pages return false; } } NextLevels(def_level, rep_level); *is_null = *def_level < descr()->max_definition_level(); if (*is_null) { return true; } if (value_offset_ == values_buffered_) { throw ParquetException("Value was non-null, but has not been buffered"); } *val = values_[value_offset_++]; return true; } // Returns true if there is a next value bool NextValue(T* val, bool* is_null) { if (level_offset_ == levels_buffered_) { if (!HasNext()) { // Out of data pages return false; } } // Out of values int16_t def_level = -1; int16_t rep_level = -1; NextLevels(&def_level, &rep_level); *is_null = def_level < descr()->max_definition_level(); if (*is_null) { return true; } if (value_offset_ == values_buffered_) { throw ParquetException("Value was non-null, but has not been buffered"); } *val = values_[value_offset_++]; return true; } virtual void PrintNext(std::ostream& out, int width, bool with_levels = false) { T val{}; int16_t def_level = -1; int16_t rep_level = -1; bool is_null = false; char buffer[80]; if (!Next(&val, &def_level, &rep_level, &is_null)) { throw ParquetException("No more values buffered"); } if (with_levels) { out << " D:" << def_level << " R:" << rep_level << " "; if (!is_null) { out << "V:"; } } if (is_null) { std::string null_fmt = format_fwf(width); snprintf(buffer, sizeof(buffer), null_fmt.c_str(), "NULL"); } else { FormatValue(&val, buffer, sizeof(buffer), width); } out << buffer; } private: // The ownership of this object is expressed through the reader_ variable in the base TypedColumnReader* typed_reader_; inline void FormatValue(void* val, char* buffer, int bufsize, int width); T* values_; }; template inline void TypedScanner::FormatValue(void* val, char* buffer, int bufsize, int width) { std::string fmt = format_fwf(width); snprintf(buffer, bufsize, fmt.c_str(), *reinterpret_cast(val)); } template <> inline void TypedScanner::FormatValue(void* val, char* buffer, int bufsize, int width) { std::string fmt = format_fwf(width); std::string result = Int96ToString(*reinterpret_cast(val)); snprintf(buffer, bufsize, fmt.c_str(), result.c_str()); } template <> inline void TypedScanner::FormatValue(void* val, char* buffer, int bufsize, int width) { std::string fmt = format_fwf(width); std::string result = ByteArrayToString(*reinterpret_cast(val)); snprintf(buffer, bufsize, fmt.c_str(), result.c_str()); } template <> inline void TypedScanner::FormatValue(void* val, char* buffer, int bufsize, int width) { std::string fmt = format_fwf(width); std::string result = FixedLenByteArrayToString( *reinterpret_cast(val), descr()->type_length()); snprintf(buffer, bufsize, fmt.c_str(), result.c_str()); } typedef TypedScanner BoolScanner; typedef TypedScanner Int32Scanner; typedef TypedScanner Int64Scanner; typedef TypedScanner Int96Scanner; typedef TypedScanner FloatScanner; typedef TypedScanner DoubleScanner; typedef TypedScanner ByteArrayScanner; typedef TypedScanner FixedLenByteArrayScanner; template int64_t ScanAll(int32_t batch_size, int16_t* def_levels, int16_t* rep_levels, uint8_t* values, int64_t* values_buffered, parquet::ColumnReader* reader) { typedef typename RType::T Type; auto typed_reader = static_cast(reader); auto vals = reinterpret_cast(&values[0]); return typed_reader->ReadBatch(batch_size, def_levels, rep_levels, vals, values_buffered); } int64_t PARQUET_EXPORT ScanAllValues(int32_t batch_size, int16_t* def_levels, int16_t* rep_levels, uint8_t* values, int64_t* values_buffered, parquet::ColumnReader* reader); } // namespace parquet