Add two ORC tools (orc-merge, orc-print-contents)

bin/orc-merge

+#!/usr/bin/env python3
+
+# Copyright (C) 2021  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+"""Merge multiple ORC files into a single one."""
+
+import argparse
+
+import pyorc
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument(
+        "-o", "--output", type=argparse.FileType(mode="wb"), required=True
+    )
+    parser.add_argument("files", type=argparse.FileType(mode="rb"), nargs="+")
+    args = parser.parse_args()
+
+    schema = str(pyorc.Reader(args.files[0]).schema)
+
+    with pyorc.Writer(args.output, schema) as writer:
+        for i, f in enumerate(args.files):
+            reader = pyorc.Reader(f)
+            if str(reader.schema) != schema:
+                raise RuntimeError(
+                    "Inconsistent ORC schemas.\n"
+                    "\tFirst file schema: {}\n"
+                    "\tFile #{} schema: {}".format(schema, i, str(reader.schema))
+                )
+            for line in reader:
+                writer.write(line)
+
+
+if __name__ == "__main__":
+    main()

bin/orc-print-contents

+#!/usr/bin/env python3
+
+# Copyright (C) 2021  The Software Heritage developers
+# See the AUTHORS file at the top-level directory of this distribution
+# License: GNU General Public License version 3, or any later version
+# See top-level LICENSE file for more information
+
+"""Print the contents of an ORC file."""
+
+import argparse
+
+import pyorc
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument("files", type=argparse.FileType(mode="rb"), nargs="+")
+    args = parser.parse_args()
+
+    for orc_file in args.files:
+        reader = pyorc.Reader(orc_file)
+        for row in reader:
+            print(row)