From a68a38d00ef685723067a7b42a362b4f5d3407a7 Mon Sep 17 00:00:00 2001
From: Sutou Kouhei <kou@clear-code.com>
Date: Sun, 14 Mar 2021 07:07:53 +0900
Subject: [PATCH] ARROW-11958: [GLib] Add garrow_chunked_array_combine()

---
 c_glib/arrow-glib/chunked-array.cpp | 24 ++++++++++++++++++++++++
 c_glib/arrow-glib/chunked-array.h   |  3 +++
 c_glib/test/test-chunked-array.rb   | 10 ++++++++++
 3 files changed, 37 insertions(+)

diff --git a/c_glib/arrow-glib/chunked-array.cpp b/c_glib/arrow-glib/chunked-array.cpp
index d2ba8ffbb799..bdb8976f35b9 100644
--- a/c_glib/arrow-glib/chunked-array.cpp
+++ b/c_glib/arrow-glib/chunked-array.cpp
@@ -330,6 +330,30 @@ garrow_chunked_array_to_string(GArrowChunkedArray *chunked_array, GError **error
   return g_strdup(arrow_chunked_array->ToString().c_str());
 }
 
+/**
+ * garrow_chunked_array_combine:
+ * @chunked_array: A #GArrowChunkedArray.
+ * @error: (nullable): Return location for a #GError or %NULL.
+ *
+ * Returns: (nullable) (transfer full): The combined array that has
+ *   all data in all chunks.
+ *
+ * Since: 4.0.0
+ */
+GArrowArray *
+garrow_chunked_array_combine(GArrowChunkedArray *chunked_array, GError **error)
+{
+  const auto arrow_chunked_array = garrow_chunked_array_get_raw(chunked_array);
+  auto arrow_combined_array = arrow::Concatenate(arrow_chunked_array->chunks());
+  if (garrow::check(error,
+                    arrow_combined_array,
+                    "[chunked-array][combine]")) {
+    return garrow_array_new_raw(&(*arrow_combined_array));
+  } else {
+    return NULL;
+  }
+}
+
 G_END_DECLS
 
 GArrowChunkedArray *
diff --git a/c_glib/arrow-glib/chunked-array.h b/c_glib/arrow-glib/chunked-array.h
index 1f7347f2b0fa..8e721f0bf992 100644
--- a/c_glib/arrow-glib/chunked-array.h
+++ b/c_glib/arrow-glib/chunked-array.h
@@ -59,5 +59,8 @@ GArrowChunkedArray *garrow_chunked_array_slice(GArrowChunkedArray *chunked_array
                                                guint64 length);
 gchar *garrow_chunked_array_to_string(GArrowChunkedArray *chunked_array,
                                       GError **error);
+GARROW_AVAILABLE_IN_4_0
+GArrowArray *garrow_chunked_array_combine(GArrowChunkedArray *chunked_array,
+                                          GError **error);
 
 G_END_DECLS
diff --git a/c_glib/test/test-chunked-array.rb b/c_glib/test/test-chunked-array.rb
index 82b46968a0d8..8f912ac846bb 100644
--- a/c_glib/test/test-chunked-array.rb
+++ b/c_glib/test/test-chunked-array.rb
@@ -128,4 +128,14 @@ def test_to_s
 ]
     PRETTY_PRINT
   end
+
+  def test_combine
+    chunks = [
+      build_boolean_array([true]),
+      build_boolean_array([false, nil]),
+    ]
+    chunked_array = Arrow::ChunkedArray.new(chunks)
+    assert_equal(build_boolean_array([true, false, nil]),
+                 chunked_array.combine)
+  end
 end