import quincy 17.2.0

[ceph.git] / ceph / src / arrow / cpp / tools / parquet / parquet_dump_schema.cc

diff --git a/ceph/src/arrow/cpp/tools/parquet/parquet_dump_schema.cc b/ceph/src/arrow/cpp/tools/parquet/parquet_dump_schema.cc
new file mode 100644 (file)
index 0000000..0d7c242
--- /dev/null
+++ b/ceph/src/arrow/cpp/tools/parquet/parquet_dump_schema.cc
@@ -0,0 +1,52 @@
+// 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 <iostream>
+
+#include "parquet/api/reader.h"
+#include "parquet/api/schema.h"
+
+int main(int argc, char** argv) {
+  bool help_flag = false;
+  std::string filename;
+
+  for (int i = 1; i < argc; i++) {
+    if (!std::strcmp(argv[i], "-?") || !std::strcmp(argv[i], "-h") ||
+        !std::strcmp(argv[i], "--help")) {
+      help_flag = true;
+    } else {
+      filename = argv[i];
+    }
+  }
+
+  if (argc != 2 || help_flag) {
+    std::cerr << "Usage: parquet-dump-schema [-h] [--help]"
+              << " <filename>" << std::endl;
+    return -1;
+  }
+
+  try {
+    std::unique_ptr<parquet::ParquetFileReader> reader =
+        parquet::ParquetFileReader::OpenFile(filename);
+    PrintSchema(reader->metadata()->schema()->schema_root().get(), std::cout);
+  } catch (const std::exception& e) {
+    std::cerr << "Parquet error: " << e.what() << std::endl;
+    return -1;
+  }
+
+  return 0;
+}