1 files changed, 78 insertions, 0 deletions
diff --git a/src/arrow/cpp/tools/parquet/parquet_scan.cc b/src/arrow/cpp/tools/parquet/parquet_scan.cc
new file mode 100644
index 000000000..2a7721e58
--- /dev/null
+++ b/src/arrow/cpp/tools/parquet/parquet_scan.cc
@@ -0,0 +1,78 @@
+// 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 <ctime>
+#include <iostream>
+#include <list>
+#include <memory>
+
+#include "parquet/api/reader.h"
+
+int main(int argc, char** argv) {
+  if (argc > 4 || argc < 1) {
+    std::cerr << "Usage: parquet-scan [--batch-size=] [--columns=...] <file>"
+              << std::endl;
+    return -1;
+  }
+
+  std::string filename;
+
+  // Read command-line options
+  int batch_size = 256;
+  const std::string COLUMNS_PREFIX = "--columns=";
+  const std::string BATCH_SIZE_PREFIX = "--batch-size=";
+  std::vector<int> columns;
+  int num_columns = 0;
+
+  char *param, *value;
+  for (int i = 1; i < argc; i++) {
+    if ((param = std::strstr(argv[i], COLUMNS_PREFIX.c_str()))) {
+      value = std::strtok(param + COLUMNS_PREFIX.length(), ",");
+      while (value) {
+        columns.push_back(std::atoi(value));
+        value = std::strtok(nullptr, ",");
+        num_columns++;
+      }
+    } else if ((param = std::strstr(argv[i], BATCH_SIZE_PREFIX.c_str()))) {
+      value = std::strtok(param + BATCH_SIZE_PREFIX.length(), " ");
+      if (value) {
+        batch_size = std::atoi(value);
+      }
+    } else {
+      filename = argv[i];
+    }
+  }
+
+  try {
+    double total_time;
+    std::clock_t start_time = std::clock();
+    std::unique_ptr<parquet::ParquetFileReader> reader =
+        parquet::ParquetFileReader::OpenFile(filename);
+
+    int64_t total_rows = parquet::ScanFileContents(columns, batch_size, reader.get());
+
+    total_time = static_cast<double>(std::clock() - start_time) /
+                 static_cast<double>(CLOCKS_PER_SEC);
+    std::cout << total_rows << " rows scanned in " << total_time << " seconds."
+              << std::endl;
+  } catch (const std::exception& e) {
+    std::cerr << "Parquet error: " << e.what() << std::endl;
+    return -1;
+  }
+
+  return 0;
+}