From d64a2d9941c36a7bc2a7959ea10ab8363192ac14 Mon Sep 17 00:00:00 2001
From: Adam Cozzette <acozzette@google.com>
Date: Wed, 29 Jun 2016 15:23:27 -0700
Subject: Integrated internal changes from Google

This includes all internal changes from around May 20 to now.
---
 src/google/protobuf/field_mask.proto | 52 ++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

(limited to 'src/google/protobuf/field_mask.proto')

diff --git a/src/google/protobuf/field_mask.proto b/src/google/protobuf/field_mask.proto
index 6af6dbe8..c51de09a 100644
--- a/src/google/protobuf/field_mask.proto
+++ b/src/google/protobuf/field_mask.proto
@@ -107,6 +107,58 @@ option java_generate_equals_and_hash = true;
 // describe the updated values, the API ignores the values of all
 // fields not covered by the mask.
 //
+// If a repeated field is specified for an update operation, the existing
+// repeated values in the target resource will be overwritten by the new values.
+// Note that a repeated field is only allowed in the last position of a field
+// mask.
+//
+// If a sub-message is specified in the last position of the field mask for an
+// update operation, then the existing sub-message in the target resource is
+// overwritten. Given the target message:
+//
+//     f {
+//       b {
+//         d : 1
+//         x : 2
+//       }
+//       c : 1
+//     }
+//
+// And an update message:
+//
+//     f {
+//       b {
+//         d : 10
+//       }
+//     }
+//
+// then if the field mask is:
+//
+//  paths: "f.b"
+//
+// then the result will be:
+//
+//     f {
+//       b {
+//         d : 10
+//       }
+//       c : 1
+//     }
+//
+// However, if the update mask was:
+//
+//  paths: "f.b.d"
+//
+// then the result would be:
+//
+//     f {
+//       b {
+//         d : 10
+//         x : 2
+//       }
+//       c : 1
+//     }
+//
 // In order to reset a field's value to the default, the field must
 // be in the mask and set to the default value in the provided resource.
 // Hence, in order to reset all fields of a resource, provide a default
-- 
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