Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/src/arrow/c_glib/example/lua/read-batch.lua b/src/arrow/c_glib/example/lua/read-batch.lua
new file mode 100644
index 000000000..a4c86763f
--- /dev/null
+++ b/src/arrow/c_glib/example/lua/read-batch.lua
@@ -0,0 +1,44 @@
+-- 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.
+
+local lgi = require 'lgi'
+local Arrow = lgi.Arrow
+
+local input_path = arg[1] or "/tmp/batch.arrow";
+
+local input = Arrow.MemoryMappedInputStream.new(input_path)
+local reader = Arrow.RecordBatchFileReader.new(input)
+
+for i = 0, reader:get_n_record_batches() - 1 do
+   local record_batch = reader:read_record_batch(i)
+   print(string.rep("=", 40))
+   print("record-batch["..i.."]:")
+   for j = 0, record_batch:get_n_columns() - 1 do
+      local column_name = record_batch:get_column_name(j)
+      local column_data = record_batch:get_column_data(j)
+      io.write("  "..column_name..": [")
+      for k = 0, record_batch:get_n_rows() - 1 do
+	 if k > 0 then
+	    io.write(", ")
+	 end
+	 io.write(column_data:get_value(k))
+      end
+      print("]")
+   end
+end
+
+input:close()