import quincy 17.2.0

[ceph.git] / ceph / src / arrow / csharp / examples / FluentBuilderExample / Program.cs

diff --git a/ceph/src/arrow/csharp/examples/FluentBuilderExample/Program.cs b/ceph/src/arrow/csharp/examples/FluentBuilderExample/Program.cs
new file mode 100644 (file)
index 0000000..6dbdc3d
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+++ b/ceph/src/arrow/csharp/examples/FluentBuilderExample/Program.cs
@@ -0,0 +1,61 @@
+// 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.
+
+using Apache.Arrow;
+using Apache.Arrow.Ipc;
+using Apache.Arrow.Memory;
+using System;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace FluentBuilderExample
+{
+    public class Program
+    {
+        public static async Task Main(string[] args)
+        {
+            // Use a specific memory pool from which arrays will be allocated (optional)
+
+            var memoryAllocator = new NativeMemoryAllocator(alignment: 64);
+
+            // Build a record batch using the Fluent API
+
+            var recordBatch = new RecordBatch.Builder(memoryAllocator)
+                .Append("Column A", false, col => col.Int32(array => array.AppendRange(Enumerable.Range(0, 10))))
+                .Append("Column B", false, col => col.Float(array => array.AppendRange(Enumerable.Range(0, 10).Select(x => Convert.ToSingle(x * 2)))))
+                .Append("Column C", false, col => col.String(array => array.AppendRange(Enumerable.Range(0, 10).Select(x => $"Item {x+1}"))))
+                .Append("Column D", false, col => col.Boolean(array => array.AppendRange(Enumerable.Range(0, 10).Select(x => x % 2 == 0))))
+                .Build();
+
+            // Print memory allocation statistics
+
+            Console.WriteLine("Allocations: {0}", memoryAllocator.Statistics.Allocations);
+            Console.WriteLine("Allocated: {0} byte(s)", memoryAllocator.Statistics.BytesAllocated);
+
+            // Write record batch to a file
+
+            using (var stream = File.OpenWrite("test.arrow"))
+            using (var writer = new ArrowFileWriter(stream, recordBatch.Schema))
+            {
+                await writer.WriteRecordBatchAsync(recordBatch);
+                await writer.WriteEndAsync();
+            }
+
+            Console.WriteLine("Done");
+            Console.ReadKey();
+        }
+    }
+}