Adding upstream version 18.2.2.upstream/18.2.2

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

1 files changed, 36 insertions, 0 deletions

diff --git a/src/arrow/ruby/red-arrow/example/read-stream.rb b/src/arrow/ruby/red-arrow/example/read-stream.rb
new file mode 100755
index 000000000..c7197120c
--- /dev/null
+++ b/src/arrow/ruby/red-arrow/example/read-stream.rb
@@ -0,0 +1,36 @@
+#!/usr/bin/env ruby
+#
+# 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.
+
+require "arrow"
+
+Arrow::MemoryMappedInputStream.open("/tmp/stream.arrow") do |input|
+  reader = Arrow::RecordBatchStreamReader.new(input)
+  fields = reader.schema.fields
+  reader.each_with_index do |record_batch, i|
+    puts("=" * 40)
+    puts("record-batch[#{i}]:")
+    fields.each do |field|
+      field_name = field.name
+      values = record_batch.collect do |record|
+        record[field_name]
+      end
+      puts("  #{field_name}: #{values.inspect}")
+    end
+  end
+end