diff --git a/c_glib/doc/gandiva-glib/gandiva-glib-docs.xml b/c_glib/doc/gandiva-glib/gandiva-glib-docs.xml
index 81bbb08c3e9..ac9f686ac27 100644
--- a/c_glib/doc/gandiva-glib/gandiva-glib-docs.xml
+++ b/c_glib/doc/gandiva-glib/gandiva-glib-docs.xml
@@ -84,6 +84,10 @@
     <title>Index of deprecated API</title>
     <xi:include href="xml/api-index-deprecated.xml"><xi:fallback /></xi:include>
   </index>
+  <index id="api-index-1-0-0" role="1.0.0">
+    <title>Index of new symbols in 1.0.0</title>
+    <xi:include href="xml/api-index-1.0.0.xml"><xi:fallback /></xi:include>
+  </index>
   <index id="api-index-0-14-0" role="0.14.0">
     <title>Index of new symbols in 0.14.0</title>
     <xi:include href="xml/api-index-0.14.0.xml"><xi:fallback /></xi:include>
diff --git a/c_glib/gandiva-glib/native-function.cpp b/c_glib/gandiva-glib/native-function.cpp
index f2f15ac785d..5ff265f1232 100644
--- a/c_glib/gandiva-glib/native-function.cpp
+++ b/c_glib/gandiva-glib/native-function.cpp
@@ -93,46 +93,25 @@ ggandiva_native_function_class_init(GGandivaNativeFunctionClass *klass)
 }
 
 /**
- * ggandiva_native_function_get_signature:
+ * ggandiva_native_function_get_signatures:
  * @native_function: A #GGandivaNativeFunction.
  *
- * Returns: (transfer full): A #GGandivaFunctionSignature that represents
- *   the signature of the native function.
+ * Returns: (element-type GGandivaFunctionSignature) (transfer full):
+ *   A list of #GGandivaFunctionSignature supported by the native function.
  *
- * Since: 0.14.0
- */
-GGandivaFunctionSignature *
-ggandiva_native_function_get_signature(GGandivaNativeFunction *native_function)
-{
-  auto gandiva_native_function =
-    ggandiva_native_function_get_raw(native_function);
-  auto &gandiva_function_signature = gandiva_native_function->signatures().front();
-  return ggandiva_function_signature_new_raw(&gandiva_function_signature);
-}
-
-/**
- * ggandiva_native_function_get_all_signatures:
- * @native_function: A #GGandivaNativeFunction.
- *
- * Returns: (transfer full): A List of #GGandivaFunctionSignature supported by
- * the native function.
- *
- * Since: ??
+ * Since: 1.0.0
  */
 GList *
-ggandiva_native_function_get_all_signatures(GGandivaNativeFunction *native_function)
+ggandiva_native_function_get_signatures(GGandivaNativeFunction *native_function)
 {
   auto gandiva_native_function =
-  ggandiva_native_function_get_raw(native_function);
-  
-  GList *function_signatures = nullptr;
-  for (auto& function_sig_raw : gandiva_native_function->signatures()) {
-    auto function_sig = ggandiva_function_signature_new_raw(&function_sig_raw);
-    function_signatures = g_list_prepend(function_signatures, function_sig);
+    ggandiva_native_function_get_raw(native_function);
+  GList *signatures = nullptr;
+  for (auto &gandiva_signature : gandiva_native_function->signatures()) {
+    auto signature = ggandiva_function_signature_new_raw(&gandiva_signature);
+    signatures = g_list_prepend(signatures, signature);
   }
-  function_signatures = g_list_reverse(function_signatures);
-  
-  return function_signatures;
+  return g_list_reverse(signatures);
 }
 
 /**
@@ -160,7 +139,7 @@ ggandiva_native_function_equal(GGandivaNativeFunction *native_function,
  * @native_function: A #GGandivaNativeFunction.
  *
  * Returns: (transfer full):
- *   The string representation of the signature of the native function.
+ *   The string representation of the signatures of the native function.
  *   It should be freed with g_free() when no longer needed.
  *
  * Since: 0.14.0
@@ -170,8 +149,17 @@ ggandiva_native_function_to_string(GGandivaNativeFunction *native_function)
 {
   auto gandiva_native_function =
     ggandiva_native_function_get_raw(native_function);
-  auto gandiva_function_signature = gandiva_native_function->signatures().front();
-  return g_strdup(gandiva_function_signature.ToString().c_str());
+  auto string = g_string_new(NULL);
+  for (auto &gandiva_signature : gandiva_native_function->signatures()) {
+    if (string->len > 0) {
+      g_string_append(string, ", ");
+    }
+    const auto &signature_string = gandiva_signature.ToString();
+    g_string_append_len(string,
+                        signature_string.data(),
+                        signature_string.length());
+  }
+  return g_string_free(string, FALSE);
 }
 
 /**
diff --git a/c_glib/gandiva-glib/native-function.h b/c_glib/gandiva-glib/native-function.h
index a7ffb60a4ce..8b4d6a44c80 100644
--- a/c_glib/gandiva-glib/native-function.h
+++ b/c_glib/gandiva-glib/native-function.h
@@ -51,7 +51,8 @@ struct _GGandivaNativeFunctionClass
   GObjectClass parent_class;
 };
 
-GGandivaFunctionSignature *ggandiva_native_function_get_signature(GGandivaNativeFunction *native_function);
+GList *
+ggandiva_native_function_get_signatures(GGandivaNativeFunction *native_function);
 gboolean
 ggandiva_native_function_equal(GGandivaNativeFunction *native_function,
                                GGandivaNativeFunction *other_native_function);
diff --git a/c_glib/test/gandiva/test-function-registry.rb b/c_glib/test/gandiva/test-function-registry.rb
index 85b03071813..25bac667310 100644
--- a/c_glib/test/gandiva/test-function-registry.rb
+++ b/c_glib/test/gandiva/test-function-registry.rb
@@ -27,7 +27,7 @@ def setup
     def test_found
       native_function = @registry.native_functions[0]
       assert_equal(native_function,
-                   @registry.lookup(native_function.signature))
+                   @registry.lookup(native_function.signatures[0]))
     end
 
     def test_not_found
diff --git a/c_glib/test/gandiva/test-native-function.rb b/c_glib/test/gandiva/test-native-function.rb
index f2546daf4a0..7888f96b678 100644
--- a/c_glib/test/gandiva/test-native-function.rb
+++ b/c_glib/test/gandiva/test-native-function.rb
@@ -32,15 +32,15 @@ def lookup(name, param_types, return_type)
     @registry.lookup(signature)
   end
 
-  def test_get_signature
-    assert_kind_of(Gandiva::FunctionSignature,
-                   @not.signature)
+  def test_signatures
+    assert_equal([Gandiva::FunctionSignature],
+                 @not.signatures.collect(&:class).uniq)
   end
 
   sub_test_case("equal") do
     def test_true
       assert do
-        @not == @registry.lookup(@not.signature)
+        @not == @registry.lookup(@not.signatures[0])
       end
     end
 
@@ -52,8 +52,11 @@ def test_false
   end
 
   def test_to_string
-    assert_equal(@not.signature.to_s,
-                 @not.to_s)
+    modulo = lookup("modulo",
+                    [int64_data_type, int64_data_type],
+                    int64_data_type)
+    assert_equal(modulo.signatures.collect(&:to_s).join(", "),
+                 modulo.to_s)
   end
 
   sub_test_case("get_result_nullbale_type") do
diff --git a/c_glib/test/helper/data-type.rb b/c_glib/test/helper/data-type.rb
index 5716f7eef5a..b8224409873 100644
--- a/c_glib/test/helper/data-type.rb
+++ b/c_glib/test/helper/data-type.rb
@@ -48,6 +48,10 @@ def int32_data_type
       Arrow::Int32DataType.new
     end
 
+    def int64_data_type
+      Arrow::Int64DataType.new
+    end
+
     def string_data_type
       Arrow::StringDataType.new
     end