From ac06277268dded00ecb50966f8da75361077151e Mon Sep 17 00:00:00 2001
From: Aaditya Srinivasan <aadityasri03@gmail.com>
Date: Thu, 9 Jul 2026 19:17:33 +0530
Subject: [PATCH] GH-50438: Add ArrowFormat::DurationArray.new(unit, values)

Signed-off-by: Aaditya Srinivasan <aadityasri03@gmail.com>
---
 .../lib/arrow-format/array.rb                 |  5 ++
 .../red-arrow-format/lib/arrow-format/type.rb | 18 ++++++
 .../test/test-duration-array.rb               | 55 +++++++++++++++++++
 3 files changed, 78 insertions(+)
 create mode 100644 ruby/red-arrow-format/test/test-duration-array.rb

diff --git a/ruby/red-arrow-format/lib/arrow-format/array.rb b/ruby/red-arrow-format/lib/arrow-format/array.rb
index bc79edf9eb0..1b74887c350 100644
--- a/ruby/red-arrow-format/lib/arrow-format/array.rb
+++ b/ruby/red-arrow-format/lib/arrow-format/array.rb
@@ -534,6 +534,11 @@ def element_size
   end
 
   class DurationArray < TemporalArray
+    class << self
+      def type_class
+        DurationType
+      end
+    end
   end
 
   class VariableSizeBinaryArray < Array
diff --git a/ruby/red-arrow-format/lib/arrow-format/type.rb b/ruby/red-arrow-format/lib/arrow-format/type.rb
index 6711f995fdb..37567a06fb6 100644
--- a/ruby/red-arrow-format/lib/arrow-format/type.rb
+++ b/ruby/red-arrow-format/lib/arrow-format/type.rb
@@ -657,6 +657,20 @@ def build_array(...)
   end
 
   class DurationType < TemporalType
+    class << self
+      def try_convert(value)
+        case value
+        when Symbol
+          unit = value
+          new(unit)
+        when self
+          value
+        else
+          nil
+        end
+      end
+    end
+
     attr_reader :unit
     def initialize(unit)
       super()
@@ -671,6 +685,10 @@ def buffer_type
       :s64
     end
 
+    def pack_template
+      "q"
+    end
+
     def build_array(...)
       DurationArray.new(self, ...)
     end
diff --git a/ruby/red-arrow-format/test/test-duration-array.rb b/ruby/red-arrow-format/test/test-duration-array.rb
new file mode 100644
index 00000000000..92362c2e4d8
--- /dev/null
+++ b/ruby/red-arrow-format/test/test-duration-array.rb
@@ -0,0 +1,55 @@
+# 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.
+
+class TestDurationArray < Test::Unit::TestCase
+  sub_test_case("#initialize") do
+    def test_no_null
+      values = [-(2 ** 63), (2 ** 63) - 1]
+      assert_equal(values,
+                   ArrowFormat::DurationArray.new(:second, values).to_a)
+    end
+
+    def test_mixed
+      values = [-(2 ** 63), nil, (2 ** 63) - 1]
+      assert_equal(values,
+                   ArrowFormat::DurationArray.new(:second, values).to_a)
+    end
+  end
+
+  sub_test_case("#==") do
+    def test_no_slice
+      values = [-(2 ** 63), nil, (2 ** 63) - 1]
+      array1 = ArrowFormat::DurationArray.new(:second, values)
+      array2 = ArrowFormat::DurationArray.new(:second, values)
+      assert_equal(array1, array2)
+    end
+
+    def test_sliced
+      values = [-(2 ** 63), nil, (2 ** 63) - 1]
+      array1 = ArrowFormat::DurationArray.new(:second, values)
+      array2 = ArrowFormat::DurationArray.new(:second, [0, *values, 0])
+      assert_equal(array1, array2.slice(1, 3))
+    end
+
+    def test_sliced_different_content
+      values = [-(2 ** 63), nil, (2 ** 63) - 1]
+      array1 = ArrowFormat::DurationArray.new(:second, values)
+      array2 = ArrowFormat::DurationArray.new(:second, [0, 0, *values, 0])
+      assert_not_equal(array1, array2.slice(1, 3))
+    end
+  end
+end