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+// 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();
+ }
+ }
+}