tools/src/FileScan.cc

/**
 * 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 "orc/ColumnPrinter.hh"

#include "orc/Exceptions.hh"

#include <getopt.h>
#include <string>
#include <memory>
#include <iostream>
#include <string>

void scanFile(std::ostream & out, const char* filename, uint64_t batchSize) {
  orc::ReaderOptions readerOpts;
  std::unique_ptr<orc::Reader> reader =
    orc::createReader(orc::readFile(filename), readerOpts);
  std::unique_ptr<orc::RowReader> rowReader = reader->createRowReader();
  std::unique_ptr<orc::ColumnVectorBatch> batch =
    rowReader->createRowBatch(batchSize);

  unsigned long rows = 0;
  unsigned long batches = 0;
  while (rowReader->next(*batch)) {
    batches += 1;
    rows += batch->numElements;
  }
  out << "Rows: " << rows << std::endl;
  out << "Batches: " << batches << std::endl;
}

int main(int argc, char* argv[]) {
  static struct option longOptions[] = {
    {"help", no_argument, ORC_NULLPTR, 'h'},
    {"batch", required_argument, ORC_NULLPTR, 'b'},
    {ORC_NULLPTR, 0, ORC_NULLPTR, 0}
  };
  bool helpFlag = false;
  uint64_t batchSize = 1024;
  int opt;
  char *tail;
  do {
    opt = getopt_long(argc, argv, "hb:", longOptions, ORC_NULLPTR);
    switch (opt) {
    case '?':
    case 'h':
      helpFlag = true;
      opt = -1;
      break;
    case 'b':
      batchSize = strtoul(optarg, &tail, 10);
      if (*tail != '\0') {
        fprintf(stderr, "The --batch parameter requires an integer option.\n");
        return 1;
      }
      break;
    }
  } while (opt != -1);
  argc -= optind;
  argv += optind;

  if (argc < 1 || helpFlag) {
    std::cerr << "Usage: orc-scan [-h] [--help]\n"
              << "                [-b<size>] [--batch=<size>] <filename>\n";
    return 1;
  } else {
    for(int i=0; i < argc; ++i) {
      try {
        scanFile(std::cout, argv[i], batchSize);
      } catch (std::exception& ex) {
        std::cerr << "Caught exception in " << argv[i]
                  << ": " << ex.what() << "\n";
        return 1;
      }
    }
  }
  return 0;
}