GH-48494: [GLib][Ruby] Add NullOptions (#48515)

### Rationale for this change

The `NullOptions` class is not available in GLib/Ruby, and it is used together with the `is_null` compute function.

### What changes are included in this PR?

This adds the `NullOptions` class to GLib.

### Are these changes tested?

Yes, with Ruby unit tests.

### Are there any user-facing changes?

Yes, a new class.

* GitHub Issue: #48494

Authored-by: Sten Larsson <[email protected]>
Signed-off-by: Sutou Kouhei <[email protected]>

Author: stenlarsson

c_glib/arrow-glib/compute.cpp

@@ -287,6 +287,8 @@ G_BEGIN_DECLS
  *
  * #GArrowModeOptions is a class to customize the `mode` function.
  *
+ * #GArrowNullOptions is a class to customize the `is_null` function.
+ *
  * There are many functions to compute data on an array.
  */
 
@@ -8016,6 +8018,95 @@ garrow_mode_options_new(void)
   return GARROW_MODE_OPTIONS(g_object_new(GARROW_TYPE_MODE_OPTIONS, NULL));
 }
 
+enum {
+  PROP_NULL_OPTIONS_NAN_IS_NULL = 1,
+};
+
+G_DEFINE_TYPE(GArrowNullOptions, garrow_null_options, GARROW_TYPE_FUNCTION_OPTIONS)
+
+static void
+garrow_null_options_set_property(GObject *object,
+                                 guint prop_id,
+                                 const GValue *value,
+                                 GParamSpec *pspec)
+{
+  auto options = garrow_null_options_get_raw(GARROW_NULL_OPTIONS(object));
+
+  switch (prop_id) {
+  case PROP_NULL_OPTIONS_NAN_IS_NULL:
+    options->nan_is_null = g_value_get_boolean(value);
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+    break;
+  }
+}
+
+static void
+garrow_null_options_get_property(GObject *object,
+                                 guint prop_id,
+                                 GValue *value,
+                                 GParamSpec *pspec)
+{
+  auto options = garrow_null_options_get_raw(GARROW_NULL_OPTIONS(object));
+
+  switch (prop_id) {
+  case PROP_NULL_OPTIONS_NAN_IS_NULL:
+    g_value_set_boolean(value, options->nan_is_null);
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
+    break;
+  }
+}
+
+static void
+garrow_null_options_init(GArrowNullOptions *object)
+{
+  auto priv = GARROW_FUNCTION_OPTIONS_GET_PRIVATE(object);
+  priv->options =
+    static_cast<arrow::compute::FunctionOptions *>(new arrow::compute::NullOptions());
+}
+
+static void
+garrow_null_options_class_init(GArrowNullOptionsClass *klass)
+{
+  auto gobject_class = G_OBJECT_CLASS(klass);
+
+  gobject_class->set_property = garrow_null_options_set_property;
+  gobject_class->get_property = garrow_null_options_get_property;
+
+  arrow::compute::NullOptions options;
+
+  GParamSpec *spec;
+  /**
+   * GArrowNullOptions:nan-is-null:
+   *
+   * Whether floating-point NaN values are considered null.
+   *
+   * Since: 23.0.0
+   */
+  spec = g_param_spec_boolean("nan-is-null",
+                              "NaN is null",
+                              "Whether floating-point NaN values are considered null",
+                              options.nan_is_null,
+                              static_cast<GParamFlags>(G_PARAM_READWRITE));
+  g_object_class_install_property(gobject_class, PROP_NULL_OPTIONS_NAN_IS_NULL, spec);
+}
+
+/**
+ * garrow_null_options_new:
+ *
+ * Returns: A newly created #GArrowNullOptions.
+ *
+ * Since: 23.0.0
+ */
+GArrowNullOptions *
+garrow_null_options_new(void)
+{
+  return GARROW_NULL_OPTIONS(g_object_new(GARROW_TYPE_NULL_OPTIONS, NULL));
+}
+
 G_END_DECLS
 
 arrow::Result<arrow::FieldRef>
@@ -8205,6 +8296,11 @@ garrow_function_options_new_raw(const arrow::compute::FunctionOptions *arrow_opt
       static_cast<const arrow::compute::ModeOptions *>(arrow_options);
     auto options = garrow_mode_options_new_raw(arrow_mode_options);
     return GARROW_FUNCTION_OPTIONS(options);
+  } else if (arrow_type_name == "NullOptions") {
+    const auto arrow_null_options =
+      static_cast<const arrow::compute::NullOptions *>(arrow_options);
+    auto options = garrow_null_options_new_raw(arrow_null_options);
+    return GARROW_FUNCTION_OPTIONS(options);
   } else {
     auto options = g_object_new(GARROW_TYPE_FUNCTION_OPTIONS, NULL);
     return GARROW_FUNCTION_OPTIONS(options);
@@ -8979,3 +9075,19 @@ garrow_mode_options_get_raw(GArrowModeOptions *options)
   return static_cast<arrow::compute::ModeOptions *>(
     garrow_function_options_get_raw(GARROW_FUNCTION_OPTIONS(options)));
 }
+
+GArrowNullOptions *
+garrow_null_options_new_raw(const arrow::compute::NullOptions *arrow_options)
+{
+  return GARROW_NULL_OPTIONS(g_object_new(GARROW_TYPE_NULL_OPTIONS,
+                                          "nan-is-null",
+                                          arrow_options->nan_is_null,
+                                          NULL));
+}
+
+arrow::compute::NullOptions *
+garrow_null_options_get_raw(GArrowNullOptions *options)
+{
+  return static_cast<arrow::compute::NullOptions *>(
+    garrow_function_options_get_raw(GARROW_FUNCTION_OPTIONS(options)));
+}

c_glib/arrow-glib/compute.h

@@ -1433,4 +1433,17 @@ GARROW_AVAILABLE_IN_23_0
 GArrowModeOptions *
 garrow_mode_options_new(void);
 
+#define GARROW_TYPE_NULL_OPTIONS (garrow_null_options_get_type())
+GARROW_AVAILABLE_IN_23_0
+G_DECLARE_DERIVABLE_TYPE(
+  GArrowNullOptions, garrow_null_options, GARROW, NULL_OPTIONS, GArrowFunctionOptions)
+struct _GArrowNullOptionsClass
+{
+  GArrowFunctionOptionsClass parent_class;
+};
+
+GARROW_AVAILABLE_IN_23_0
+GArrowNullOptions *
+garrow_null_options_new(void);
+
 G_END_DECLS

c_glib/arrow-glib/compute.hpp

@@ -241,3 +241,8 @@ GArrowModeOptions *
 garrow_mode_options_new_raw(const arrow::compute::ModeOptions *arrow_options);
 arrow::compute::ModeOptions *
 garrow_mode_options_get_raw(GArrowModeOptions *options);
+
+GArrowNullOptions *
+garrow_null_options_new_raw(const arrow::compute::NullOptions *arrow_options);
+arrow::compute::NullOptions *
+garrow_null_options_get_raw(GArrowNullOptions *options);

c_glib/test/test-null-options.rb

@@ -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.
+
+class TestNullOptions < Test::Unit::TestCase
+  include Helper::Buildable
+
+  def setup
+    @options = Arrow::NullOptions.new
+  end
+
+  def test_nan_is_null_property
+    assert do
+      !@options.nan_is_null?
+    end
+    @options.nan_is_null = true
+    assert do
+      @options.nan_is_null?
+    end
+  end
+
+  def test_is_null_function
+    args = [
+      Arrow::ArrayDatum.new(build_float_array([1.0, Float::NAN, 2.0, nil, 4.0])),
+    ]
+    is_null_function = Arrow::Function.find("is_null")
+    @options.nan_is_null = true
+    result = is_null_function.execute(args, @options).value
+    assert_equal(build_boolean_array([false, true, false, true, false]), result)
+  end
+end