diff --git a/apis/Google.Cloud.Firestore.V1/Google.Cloud.Firestore.V1/Query.cs b/apis/Google.Cloud.Firestore.V1/Google.Cloud.Firestore.V1/Query.cs
index 230f25cc2031..f88f54cf2eba 100644
--- a/apis/Google.Cloud.Firestore.V1/Google.Cloud.Firestore.V1/Query.cs
+++ b/apis/Google.Cloud.Firestore.V1/Google.Cloud.Firestore.V1/Query.cs
@@ -27,7 +27,7 @@ public static partial class QueryReflection {
             "Ch9nb29nbGUvZmlyZXN0b3JlL3YxL3F1ZXJ5LnByb3RvEhNnb29nbGUuZmly",
             "ZXN0b3JlLnYxGiJnb29nbGUvZmlyZXN0b3JlL3YxL2RvY3VtZW50LnByb3Rv",
             "Gh5nb29nbGUvcHJvdG9idWYvd3JhcHBlcnMucHJvdG8aHGdvb2dsZS9hcGkv",
-            "YW5ub3RhdGlvbnMucHJvdG8i2g4KD1N0cnVjdHVyZWRRdWVyeRI/CgZzZWxl",
+            "YW5ub3RhdGlvbnMucHJvdG8i+g4KD1N0cnVjdHVyZWRRdWVyeRI/CgZzZWxl",
             "Y3QYASABKAsyLy5nb29nbGUuZmlyZXN0b3JlLnYxLlN0cnVjdHVyZWRRdWVy",
             "eS5Qcm9qZWN0aW9uEkUKBGZyb20YAiADKAsyNy5nb29nbGUuZmlyZXN0b3Jl",
             "LnYxLlN0cnVjdHVyZWRRdWVyeS5Db2xsZWN0aW9uU2VsZWN0b3ISOgoFd2hl",
@@ -48,33 +48,34 @@ public static partial class QueryReflection {
             "b2dsZS5maXJlc3RvcmUudjEuU3RydWN0dXJlZFF1ZXJ5LkNvbXBvc2l0ZUZp",
             "bHRlci5PcGVyYXRvchI8CgdmaWx0ZXJzGAIgAygLMisuZ29vZ2xlLmZpcmVz",
             "dG9yZS52MS5TdHJ1Y3R1cmVkUXVlcnkuRmlsdGVyIi0KCE9wZXJhdG9yEhgK",
-            "FE9QRVJBVE9SX1VOU1BFQ0lGSUVEEAASBwoDQU5EEAEa3QIKC0ZpZWxkRmls",
+            "FE9QRVJBVE9SX1VOU1BFQ0lGSUVEEAASBwoDQU5EEAEa/QIKC0ZpZWxkRmls",
             "dGVyEkIKBWZpZWxkGAEgASgLMjMuZ29vZ2xlLmZpcmVzdG9yZS52MS5TdHJ1",
             "Y3R1cmVkUXVlcnkuRmllbGRSZWZlcmVuY2USRQoCb3AYAiABKA4yOS5nb29n",
             "bGUuZmlyZXN0b3JlLnYxLlN0cnVjdHVyZWRRdWVyeS5GaWVsZEZpbHRlci5P",
             "cGVyYXRvchIpCgV2YWx1ZRgDIAEoCzIaLmdvb2dsZS5maXJlc3RvcmUudjEu",
-            "VmFsdWUilwEKCE9wZXJhdG9yEhgKFE9QRVJBVE9SX1VOU1BFQ0lGSUVEEAAS",
+            "VmFsdWUitwEKCE9wZXJhdG9yEhgKFE9QRVJBVE9SX1VOU1BFQ0lGSUVEEAAS",
             "DQoJTEVTU19USEFOEAESFgoSTEVTU19USEFOX09SX0VRVUFMEAISEAoMR1JF",
             "QVRFUl9USEFOEAMSGQoVR1JFQVRFUl9USEFOX09SX0VRVUFMEAQSCQoFRVFV",
-            "QUwQBRISCg5BUlJBWV9DT05UQUlOUxAHGukBCgtVbmFyeUZpbHRlchJFCgJv",
-            "cBgBIAEoDjI5Lmdvb2dsZS5maXJlc3RvcmUudjEuU3RydWN0dXJlZFF1ZXJ5",
-            "LlVuYXJ5RmlsdGVyLk9wZXJhdG9yEkQKBWZpZWxkGAIgASgLMjMuZ29vZ2xl",
-            "LmZpcmVzdG9yZS52MS5TdHJ1Y3R1cmVkUXVlcnkuRmllbGRSZWZlcmVuY2VI",
-            "ACI9CghPcGVyYXRvchIYChRPUEVSQVRPUl9VTlNQRUNJRklFRBAAEgoKBklT",
-            "X05BThACEgsKB0lTX05VTEwQA0IOCgxvcGVyYW5kX3R5cGUajgEKBU9yZGVy",
-            "EkIKBWZpZWxkGAEgASgLMjMuZ29vZ2xlLmZpcmVzdG9yZS52MS5TdHJ1Y3R1",
-            "cmVkUXVlcnkuRmllbGRSZWZlcmVuY2USQQoJZGlyZWN0aW9uGAIgASgOMi4u",
-            "Z29vZ2xlLmZpcmVzdG9yZS52MS5TdHJ1Y3R1cmVkUXVlcnkuRGlyZWN0aW9u",
-            "GiQKDkZpZWxkUmVmZXJlbmNlEhIKCmZpZWxkX3BhdGgYAiABKAkaUQoKUHJv",
-            "amVjdGlvbhJDCgZmaWVsZHMYAiADKAsyMy5nb29nbGUuZmlyZXN0b3JlLnYx",
-            "LlN0cnVjdHVyZWRRdWVyeS5GaWVsZFJlZmVyZW5jZSJFCglEaXJlY3Rpb24S",
-            "GQoVRElSRUNUSU9OX1VOU1BFQ0lGSUVEEAASDQoJQVNDRU5ESU5HEAESDgoK",
-            "REVTQ0VORElORxACIkQKBkN1cnNvchIqCgZ2YWx1ZXMYASADKAsyGi5nb29n",
-            "bGUuZmlyZXN0b3JlLnYxLlZhbHVlEg4KBmJlZm9yZRgCIAEoCEKkAQoXY29t",
-            "Lmdvb2dsZS5maXJlc3RvcmUudjFCClF1ZXJ5UHJvdG9QAVo8Z29vZ2xlLmdv",
-            "bGFuZy5vcmcvZ2VucHJvdG8vZ29vZ2xlYXBpcy9maXJlc3RvcmUvdjE7Zmly",
-            "ZXN0b3JlogIER0NGU6oCGUdvb2dsZS5DbG91ZC5GaXJlc3RvcmUuVjHKAhlH",
-            "b29nbGVcQ2xvdWRcRmlyZXN0b3JlXFYxYgZwcm90bzM="));
+            "QUwQBRISCg5BUlJBWV9DT05UQUlOUxAHEgYKAklOEAgSFgoSQVJSQVlfQ09O",
+            "VEFJTlNfQU5ZEAka6QEKC1VuYXJ5RmlsdGVyEkUKAm9wGAEgASgOMjkuZ29v",
+            "Z2xlLmZpcmVzdG9yZS52MS5TdHJ1Y3R1cmVkUXVlcnkuVW5hcnlGaWx0ZXIu",
+            "T3BlcmF0b3ISRAoFZmllbGQYAiABKAsyMy5nb29nbGUuZmlyZXN0b3JlLnYx",
+            "LlN0cnVjdHVyZWRRdWVyeS5GaWVsZFJlZmVyZW5jZUgAIj0KCE9wZXJhdG9y",
+            "EhgKFE9QRVJBVE9SX1VOU1BFQ0lGSUVEEAASCgoGSVNfTkFOEAISCwoHSVNf",
+            "TlVMTBADQg4KDG9wZXJhbmRfdHlwZRpRCgpQcm9qZWN0aW9uEkMKBmZpZWxk",
+            "cxgCIAMoCzIzLmdvb2dsZS5maXJlc3RvcmUudjEuU3RydWN0dXJlZFF1ZXJ5",
+            "LkZpZWxkUmVmZXJlbmNlGo4BCgVPcmRlchJCCgVmaWVsZBgBIAEoCzIzLmdv",
+            "b2dsZS5maXJlc3RvcmUudjEuU3RydWN0dXJlZFF1ZXJ5LkZpZWxkUmVmZXJl",
+            "bmNlEkEKCWRpcmVjdGlvbhgCIAEoDjIuLmdvb2dsZS5maXJlc3RvcmUudjEu",
+            "U3RydWN0dXJlZFF1ZXJ5LkRpcmVjdGlvbhokCg5GaWVsZFJlZmVyZW5jZRIS",
+            "CgpmaWVsZF9wYXRoGAIgASgJIkUKCURpcmVjdGlvbhIZChVESVJFQ1RJT05f",
+            "VU5TUEVDSUZJRUQQABINCglBU0NFTkRJTkcQARIOCgpERVNDRU5ESU5HEAIi",
+            "RAoGQ3Vyc29yEioKBnZhbHVlcxgBIAMoCzIaLmdvb2dsZS5maXJlc3RvcmUu",
+            "djEuVmFsdWUSDgoGYmVmb3JlGAIgASgIQqQBChdjb20uZ29vZ2xlLmZpcmVz",
+            "dG9yZS52MUIKUXVlcnlQcm90b1ABWjxnb29nbGUuZ29sYW5nLm9yZy9nZW5w",
+            "cm90by9nb29nbGVhcGlzL2ZpcmVzdG9yZS92MTtmaXJlc3RvcmWiAgRHQ0ZT",
+            "qgIZR29vZ2xlLkNsb3VkLkZpcmVzdG9yZS5WMcoCGUdvb2dsZVxDbG91ZFxG",
+            "aXJlc3RvcmVcVjFiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Cloud.Firestore.V1.DocumentReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.WrappersReflection.Descriptor, global::Google.Api.AnnotationsReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(null, new pbr::GeneratedClrTypeInfo[] {
@@ -83,9 +84,9 @@ public static partial class QueryReflection {
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.CompositeFilter), global::Google.Cloud.Firestore.V1.StructuredQuery.Types.CompositeFilter.Parser, new[]{ "Op", "Filters" }, null, new[]{ typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.CompositeFilter.Types.Operator) }, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldFilter), global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldFilter.Parser, new[]{ "Field", "Op", "Value" }, null, new[]{ typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldFilter.Types.Operator) }, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.UnaryFilter), global::Google.Cloud.Firestore.V1.StructuredQuery.Types.UnaryFilter.Parser, new[]{ "Op", "Field" }, new[]{ "OperandType" }, new[]{ typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.UnaryFilter.Types.Operator) }, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Projection), global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Projection.Parser, new[]{ "Fields" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Order), global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Order.Parser, new[]{ "Field", "Direction" }, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference), global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference.Parser, new[]{ "FieldPath" }, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Projection), global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Projection.Parser, new[]{ "Fields" }, null, null, null)}),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference), global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference.Parser, new[]{ "FieldPath" }, null, null, null)}),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.Firestore.V1.Cursor), global::Google.Cloud.Firestore.V1.Cursor.Parser, new[]{ "Values", "Before" }, null, null, null)
           }));
     }
@@ -1350,6 +1351,16 @@ public enum Operator {
             /// Contains. Requires that the field is an array.
             /// </summary>
             [pbr::OriginalName("ARRAY_CONTAINS")] ArrayContains = 7,
+            /// <summary>
+            /// In. Requires that `value` is a non-empty ArrayValue with at most 10
+            /// values.
+            /// </summary>
+            [pbr::OriginalName("IN")] In = 8,
+            /// <summary>
+            /// Contains any. Requires that the field is an array and
+            /// `value` is a non-empty ArrayValue with at most 10 values.
+            /// </summary>
+            [pbr::OriginalName("ARRAY_CONTAINS_ANY")] ArrayContainsAny = 9,
           }
 
         }
@@ -1585,13 +1596,13 @@ public enum Operator {
       }
 
       /// <summary>
-      /// An order on a field.
+      /// The projection of document's fields to return.
       /// </summary>
-      public sealed partial class Order : pb::IMessage<Order> {
-        private static readonly pb::MessageParser<Order> _parser = new pb::MessageParser<Order>(() => new Order());
+      public sealed partial class Projection : pb::IMessage<Projection> {
+        private static readonly pb::MessageParser<Projection> _parser = new pb::MessageParser<Projection>(() => new Projection());
         private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public static pb::MessageParser<Order> Parser { get { return _parser; } }
+        public static pb::MessageParser<Projection> Parser { get { return _parser; } }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pbr::MessageDescriptor Descriptor {
@@ -1604,75 +1615,60 @@ public sealed partial class Order : pb::IMessage<Order> {
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public Order() {
+        public Projection() {
           OnConstruction();
         }
 
         partial void OnConstruction();
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public Order(Order other) : this() {
-          field_ = other.field_ != null ? other.field_.Clone() : null;
-          direction_ = other.direction_;
+        public Projection(Projection other) : this() {
+          fields_ = other.fields_.Clone();
           _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public Order Clone() {
-          return new Order(this);
-        }
-
-        /// <summary>Field number for the "field" field.</summary>
-        public const int FieldFieldNumber = 1;
-        private global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference field_;
-        /// <summary>
-        /// The field to order by.
-        /// </summary>
-        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference Field {
-          get { return field_; }
-          set {
-            field_ = value;
-          }
+        public Projection Clone() {
+          return new Projection(this);
         }
 
-        /// <summary>Field number for the "direction" field.</summary>
-        public const int DirectionFieldNumber = 2;
-        private global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Direction direction_ = 0;
+        /// <summary>Field number for the "fields" field.</summary>
+        public const int FieldsFieldNumber = 2;
+        private static readonly pb::FieldCodec<global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference> _repeated_fields_codec
+            = pb::FieldCodec.ForMessage(18, global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference.Parser);
+        private readonly pbc::RepeatedField<global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference> fields_ = new pbc::RepeatedField<global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference>();
         /// <summary>
-        /// The direction to order by. Defaults to `ASCENDING`.
+        /// The fields to return.
+        ///
+        /// If empty, all fields are returned. To only return the name
+        /// of the document, use `['__name__']`.
         /// </summary>
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Direction Direction {
-          get { return direction_; }
-          set {
-            direction_ = value;
-          }
+        public pbc::RepeatedField<global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference> Fields {
+          get { return fields_; }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override bool Equals(object other) {
-          return Equals(other as Order);
+          return Equals(other as Projection);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public bool Equals(Order other) {
+        public bool Equals(Projection other) {
           if (ReferenceEquals(other, null)) {
             return false;
           }
           if (ReferenceEquals(other, this)) {
             return true;
           }
-          if (!object.Equals(Field, other.Field)) return false;
-          if (Direction != other.Direction) return false;
+          if(!fields_.Equals(other.fields_)) return false;
           return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override int GetHashCode() {
           int hash = 1;
-          if (field_ != null) hash ^= Field.GetHashCode();
-          if (Direction != 0) hash ^= Direction.GetHashCode();
+          hash ^= fields_.GetHashCode();
           if (_unknownFields != null) {
             hash ^= _unknownFields.GetHashCode();
           }
@@ -1686,14 +1682,7 @@ public sealed partial class Order : pb::IMessage<Order> {
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public void WriteTo(pb::CodedOutputStream output) {
-          if (field_ != null) {
-            output.WriteRawTag(10);
-            output.WriteMessage(Field);
-          }
-          if (Direction != 0) {
-            output.WriteRawTag(16);
-            output.WriteEnum((int) Direction);
-          }
+          fields_.WriteTo(output, _repeated_fields_codec);
           if (_unknownFields != null) {
             _unknownFields.WriteTo(output);
           }
@@ -1702,12 +1691,7 @@ public sealed partial class Order : pb::IMessage<Order> {
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public int CalculateSize() {
           int size = 0;
-          if (field_ != null) {
-            size += 1 + pb::CodedOutputStream.ComputeMessageSize(Field);
-          }
-          if (Direction != 0) {
-            size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Direction);
-          }
+          size += fields_.CalculateSize(_repeated_fields_codec);
           if (_unknownFields != null) {
             size += _unknownFields.CalculateSize();
           }
@@ -1715,19 +1699,11 @@ public sealed partial class Order : pb::IMessage<Order> {
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public void MergeFrom(Order other) {
+        public void MergeFrom(Projection other) {
           if (other == null) {
             return;
           }
-          if (other.field_ != null) {
-            if (field_ == null) {
-              Field = new global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference();
-            }
-            Field.MergeFrom(other.Field);
-          }
-          if (other.Direction != 0) {
-            Direction = other.Direction;
-          }
+          fields_.Add(other.fields_);
           _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
@@ -1739,15 +1715,8 @@ public sealed partial class Order : pb::IMessage<Order> {
               default:
                 _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
-              case 10: {
-                if (field_ == null) {
-                  Field = new global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference();
-                }
-                input.ReadMessage(Field);
-                break;
-              }
-              case 16: {
-                Direction = (global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Direction) input.ReadEnum();
+              case 18: {
+                fields_.AddEntriesFrom(input, _repeated_fields_codec);
                 break;
               }
             }
@@ -1757,13 +1726,13 @@ public sealed partial class Order : pb::IMessage<Order> {
       }
 
       /// <summary>
-      /// A reference to a field, such as `max(messages.time) as max_time`.
+      /// An order on a field.
       /// </summary>
-      public sealed partial class FieldReference : pb::IMessage<FieldReference> {
-        private static readonly pb::MessageParser<FieldReference> _parser = new pb::MessageParser<FieldReference>(() => new FieldReference());
+      public sealed partial class Order : pb::IMessage<Order> {
+        private static readonly pb::MessageParser<Order> _parser = new pb::MessageParser<Order>(() => new Order());
         private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public static pb::MessageParser<FieldReference> Parser { get { return _parser; } }
+        public static pb::MessageParser<Order> Parser { get { return _parser; } }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pbr::MessageDescriptor Descriptor {
@@ -1776,55 +1745,75 @@ public sealed partial class FieldReference : pb::IMessage<FieldReference> {
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public FieldReference() {
+        public Order() {
           OnConstruction();
         }
 
         partial void OnConstruction();
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public FieldReference(FieldReference other) : this() {
-          fieldPath_ = other.fieldPath_;
+        public Order(Order other) : this() {
+          field_ = other.field_ != null ? other.field_.Clone() : null;
+          direction_ = other.direction_;
           _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public FieldReference Clone() {
-          return new FieldReference(this);
+        public Order Clone() {
+          return new Order(this);
         }
 
-        /// <summary>Field number for the "field_path" field.</summary>
-        public const int FieldPathFieldNumber = 2;
-        private string fieldPath_ = "";
+        /// <summary>Field number for the "field" field.</summary>
+        public const int FieldFieldNumber = 1;
+        private global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference field_;
+        /// <summary>
+        /// The field to order by.
+        /// </summary>
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public string FieldPath {
-          get { return fieldPath_; }
+        public global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference Field {
+          get { return field_; }
           set {
-            fieldPath_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+            field_ = value;
+          }
+        }
+
+        /// <summary>Field number for the "direction" field.</summary>
+        public const int DirectionFieldNumber = 2;
+        private global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Direction direction_ = 0;
+        /// <summary>
+        /// The direction to order by. Defaults to `ASCENDING`.
+        /// </summary>
+        [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+        public global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Direction Direction {
+          get { return direction_; }
+          set {
+            direction_ = value;
           }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override bool Equals(object other) {
-          return Equals(other as FieldReference);
+          return Equals(other as Order);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public bool Equals(FieldReference other) {
+        public bool Equals(Order other) {
           if (ReferenceEquals(other, null)) {
             return false;
           }
           if (ReferenceEquals(other, this)) {
             return true;
           }
-          if (FieldPath != other.FieldPath) return false;
+          if (!object.Equals(Field, other.Field)) return false;
+          if (Direction != other.Direction) return false;
           return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override int GetHashCode() {
           int hash = 1;
-          if (FieldPath.Length != 0) hash ^= FieldPath.GetHashCode();
+          if (field_ != null) hash ^= Field.GetHashCode();
+          if (Direction != 0) hash ^= Direction.GetHashCode();
           if (_unknownFields != null) {
             hash ^= _unknownFields.GetHashCode();
           }
@@ -1838,9 +1827,13 @@ public sealed partial class FieldReference : pb::IMessage<FieldReference> {
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public void WriteTo(pb::CodedOutputStream output) {
-          if (FieldPath.Length != 0) {
-            output.WriteRawTag(18);
-            output.WriteString(FieldPath);
+          if (field_ != null) {
+            output.WriteRawTag(10);
+            output.WriteMessage(Field);
+          }
+          if (Direction != 0) {
+            output.WriteRawTag(16);
+            output.WriteEnum((int) Direction);
           }
           if (_unknownFields != null) {
             _unknownFields.WriteTo(output);
@@ -1850,8 +1843,11 @@ public sealed partial class FieldReference : pb::IMessage<FieldReference> {
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public int CalculateSize() {
           int size = 0;
-          if (FieldPath.Length != 0) {
-            size += 1 + pb::CodedOutputStream.ComputeStringSize(FieldPath);
+          if (field_ != null) {
+            size += 1 + pb::CodedOutputStream.ComputeMessageSize(Field);
+          }
+          if (Direction != 0) {
+            size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Direction);
           }
           if (_unknownFields != null) {
             size += _unknownFields.CalculateSize();
@@ -1860,12 +1856,18 @@ public sealed partial class FieldReference : pb::IMessage<FieldReference> {
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public void MergeFrom(FieldReference other) {
+        public void MergeFrom(Order other) {
           if (other == null) {
             return;
           }
-          if (other.FieldPath.Length != 0) {
-            FieldPath = other.FieldPath;
+          if (other.field_ != null) {
+            if (field_ == null) {
+              Field = new global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference();
+            }
+            Field.MergeFrom(other.Field);
+          }
+          if (other.Direction != 0) {
+            Direction = other.Direction;
           }
           _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
@@ -1878,8 +1880,15 @@ public sealed partial class FieldReference : pb::IMessage<FieldReference> {
               default:
                 _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
-              case 18: {
-                FieldPath = input.ReadString();
+              case 10: {
+                if (field_ == null) {
+                  Field = new global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference();
+                }
+                input.ReadMessage(Field);
+                break;
+              }
+              case 16: {
+                Direction = (global::Google.Cloud.Firestore.V1.StructuredQuery.Types.Direction) input.ReadEnum();
                 break;
               }
             }
@@ -1889,13 +1898,13 @@ public sealed partial class FieldReference : pb::IMessage<FieldReference> {
       }
 
       /// <summary>
-      /// The projection of document's fields to return.
+      /// A reference to a field, such as `max(messages.time) as max_time`.
       /// </summary>
-      public sealed partial class Projection : pb::IMessage<Projection> {
-        private static readonly pb::MessageParser<Projection> _parser = new pb::MessageParser<Projection>(() => new Projection());
+      public sealed partial class FieldReference : pb::IMessage<FieldReference> {
+        private static readonly pb::MessageParser<FieldReference> _parser = new pb::MessageParser<FieldReference>(() => new FieldReference());
         private pb::UnknownFieldSet _unknownFields;
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public static pb::MessageParser<Projection> Parser { get { return _parser; } }
+        public static pb::MessageParser<FieldReference> Parser { get { return _parser; } }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public static pbr::MessageDescriptor Descriptor {
@@ -1908,60 +1917,55 @@ public sealed partial class Projection : pb::IMessage<Projection> {
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public Projection() {
+        public FieldReference() {
           OnConstruction();
         }
 
         partial void OnConstruction();
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public Projection(Projection other) : this() {
-          fields_ = other.fields_.Clone();
+        public FieldReference(FieldReference other) : this() {
+          fieldPath_ = other.fieldPath_;
           _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public Projection Clone() {
-          return new Projection(this);
+        public FieldReference Clone() {
+          return new FieldReference(this);
         }
 
-        /// <summary>Field number for the "fields" field.</summary>
-        public const int FieldsFieldNumber = 2;
-        private static readonly pb::FieldCodec<global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference> _repeated_fields_codec
-            = pb::FieldCodec.ForMessage(18, global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference.Parser);
-        private readonly pbc::RepeatedField<global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference> fields_ = new pbc::RepeatedField<global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference>();
-        /// <summary>
-        /// The fields to return.
-        ///
-        /// If empty, all fields are returned. To only return the name
-        /// of the document, use `['__name__']`.
-        /// </summary>
+        /// <summary>Field number for the "field_path" field.</summary>
+        public const int FieldPathFieldNumber = 2;
+        private string fieldPath_ = "";
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public pbc::RepeatedField<global::Google.Cloud.Firestore.V1.StructuredQuery.Types.FieldReference> Fields {
-          get { return fields_; }
+        public string FieldPath {
+          get { return fieldPath_; }
+          set {
+            fieldPath_ = pb::ProtoPreconditions.CheckNotNull(value, "value");
+          }
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override bool Equals(object other) {
-          return Equals(other as Projection);
+          return Equals(other as FieldReference);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public bool Equals(Projection other) {
+        public bool Equals(FieldReference other) {
           if (ReferenceEquals(other, null)) {
             return false;
           }
           if (ReferenceEquals(other, this)) {
             return true;
           }
-          if(!fields_.Equals(other.fields_)) return false;
+          if (FieldPath != other.FieldPath) return false;
           return Equals(_unknownFields, other._unknownFields);
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public override int GetHashCode() {
           int hash = 1;
-          hash ^= fields_.GetHashCode();
+          if (FieldPath.Length != 0) hash ^= FieldPath.GetHashCode();
           if (_unknownFields != null) {
             hash ^= _unknownFields.GetHashCode();
           }
@@ -1975,7 +1979,10 @@ public sealed partial class Projection : pb::IMessage<Projection> {
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public void WriteTo(pb::CodedOutputStream output) {
-          fields_.WriteTo(output, _repeated_fields_codec);
+          if (FieldPath.Length != 0) {
+            output.WriteRawTag(18);
+            output.WriteString(FieldPath);
+          }
           if (_unknownFields != null) {
             _unknownFields.WriteTo(output);
           }
@@ -1984,7 +1991,9 @@ public sealed partial class Projection : pb::IMessage<Projection> {
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
         public int CalculateSize() {
           int size = 0;
-          size += fields_.CalculateSize(_repeated_fields_codec);
+          if (FieldPath.Length != 0) {
+            size += 1 + pb::CodedOutputStream.ComputeStringSize(FieldPath);
+          }
           if (_unknownFields != null) {
             size += _unknownFields.CalculateSize();
           }
@@ -1992,11 +2001,13 @@ public sealed partial class Projection : pb::IMessage<Projection> {
         }
 
         [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
-        public void MergeFrom(Projection other) {
+        public void MergeFrom(FieldReference other) {
           if (other == null) {
             return;
           }
-          fields_.Add(other.fields_);
+          if (other.FieldPath.Length != 0) {
+            FieldPath = other.FieldPath;
+          }
           _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
         }
 
@@ -2009,7 +2020,7 @@ public sealed partial class Projection : pb::IMessage<Projection> {
                 _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
                 break;
               case 18: {
-                fields_.AddEntriesFrom(input, _repeated_fields_codec);
+                FieldPath = input.ReadString();
                 break;
               }
             }