ParquetFixedLengthEncoder.h

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/*
 * Copyright 2020 OmniSci, Inc.
 *
 * Licensed 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 "ParquetInPlaceEncoder.h"

namespace foreign_storage {
template <typename V, typename T>
class ParquetFixedLengthEncoder : public TypedParquetInPlaceEncoder<V, T> {
 public:
  ParquetFixedLengthEncoder(Data_Namespace::AbstractBuffer* buffer,
                            const ColumnDescriptor* column_desciptor,
                            const parquet::ColumnDescriptor* parquet_column_descriptor)
      : TypedParquetInPlaceEncoder<V, T>(buffer,
                                         column_desciptor,
                                         parquet_column_descriptor) {}

  void encodeAndCopy(const int8_t* parquet_data_bytes,
                     int8_t* omnisci_data_bytes) override {
    const auto& parquet_data_value = reinterpret_cast<const T*>(parquet_data_bytes)[0];
    auto& omnisci_data_value = reinterpret_cast<V*>(omnisci_data_bytes)[0];
    omnisci_data_value = parquet_data_value;
  }

 protected:
  bool encodingIsIdentityForSameTypes() const override { return true; }
};

template <typename V, typename T, typename U>
class ParquetUnsignedFixedLengthEncoder : public TypedParquetInPlaceEncoder<V, T> {
 public:
  ParquetUnsignedFixedLengthEncoder(
      Data_Namespace::AbstractBuffer* buffer,
      const ColumnDescriptor* column_desciptor,
      const parquet::ColumnDescriptor* parquet_column_descriptor)
      : TypedParquetInPlaceEncoder<V, T>(buffer,
                                         column_desciptor,
                                         parquet_column_descriptor) {}

  void encodeAndCopy(const int8_t* parquet_data_bytes,
                     int8_t* omnisci_data_bytes) override {
    const auto& parquet_data_value = reinterpret_cast<const T*>(parquet_data_bytes)[0];
    auto& omnisci_data_value = reinterpret_cast<V*>(omnisci_data_bytes)[0];
    omnisci_data_value = static_cast<U>(parquet_data_value);
  }
};

}  // namespace foreign_storage