diff --git a/vendor/github.com/dgraph-io/dgo/protos/api/api.pb.go b/vendor/github.com/dgraph-io/dgo/protos/api/api.pb.go
index 00a78e736a1..103c8e7db2a 100644
--- a/vendor/github.com/dgraph-io/dgo/protos/api/api.pb.go
+++ b/vendor/github.com/dgraph-io/dgo/protos/api/api.pb.go
@@ -348,6 +348,7 @@ type Mutation struct {
 	SetNquads            []byte   `protobuf:"bytes,3,opt,name=set_nquads,json=setNquads,proto3" json:"set_nquads,omitempty"`
 	DelNquads            []byte   `protobuf:"bytes,4,opt,name=del_nquads,json=delNquads,proto3" json:"del_nquads,omitempty"`
 	Query                string   `protobuf:"bytes,5,opt,name=query,proto3" json:"query,omitempty"`
+	Cond                 string   `protobuf:"bytes,6,opt,name=cond,proto3" json:"cond,omitempty"`
 	Set                  []*NQuad `protobuf:"bytes,10,rep,name=set,proto3" json:"set,omitempty"`
 	Del                  []*NQuad `protobuf:"bytes,11,rep,name=del,proto3" json:"del,omitempty"`
 	StartTs              uint64   `protobuf:"varint,13,opt,name=start_ts,json=startTs,proto3" json:"start_ts,omitempty"`
@@ -426,6 +427,13 @@ func (m *Mutation) GetQuery() string {
 	return ""
 }
 
+func (m *Mutation) GetCond() string {
+	if m != nil {
+		return m.Cond
+	}
+	return ""
+}
+
 func (m *Mutation) GetSet() []*NQuad {
 	if m != nil {
 		return m.Set
@@ -1710,12 +1718,12 @@ func init() {
 func init() { proto.RegisterFile("api.proto", fileDescriptor_00212fb1f9d3bf1c) }
 
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+	0x80, 0xdb, 0xd2, 0xbe, 0x73, 0x06, 0xc1, 0xdd, 0x33, 0xd8, 0x06, 0x9f, 0x71, 0xe4, 0xea, 0xc4,
+	0x45, 0x0e, 0x98, 0x1a, 0xd6, 0x87, 0x50, 0x9c, 0x2b, 0x6d, 0x65, 0x5a, 0x65, 0xc2, 0xab, 0xb8,
+	0xe9, 0x2b, 0xb9, 0xc2, 0xa2, 0x6a, 0x60, 0x95, 0xa0, 0x8c, 0xf5, 0x54, 0x6a, 0x99, 0x9a, 0x7e,
+	0x8b, 0x40, 0xa7, 0xdc, 0x99, 0x75, 0x1b, 0x1f, 0x98, 0x75, 0x49, 0x08, 0xad, 0x83, 0x17, 0x72,
+	0xfe, 0x2a, 0xd9, 0x86, 0xf0, 0x4c, 0x6a, 0x83, 0x07, 0xd8, 0x83, 0x86, 0x15, 0x8b, 0xaa, 0xab,
+	0xac, 0x58, 0x24, 0x7f, 0x0d, 0x20, 0xf4, 0x4b, 0xd9, 0x13, 0x68, 0xdc, 0xf6, 0xff, 0xfd, 0xf5,
+	0xaf, 0x0e, 0xc6, 0x55, 0xf7, 0xa3, 0x05, 0xfb, 0x0a, 0xfb, 0xe4, 0xcd, 0x52, 0x16, 0xf3, 0xac,
+	0x58, 0x50, 0x94, 0x9b, 0x7e, 0x5e, 0x54, 0xf6, 0xa7, 0x37, 0x34, 0x5f, 0x33, 0xdd, 0xfa, 0x29,
+	0x44, 0xe3, 0xf7, 0x74, 0xf8, 0xc6, 0x7b, 0x3a, 0xbc, 0xb9, 0xde, 0xe1, 0x03, 0x80, 0xdb, 0x2f,
+	0xb2, 0x7b, 0xd0, 0x39, 0x38, 0x1e, 0x8f, 0x26, 0xd3, 0xd9, 0xe9, 0xf8, 0x10, 0x0f, 0xf9, 0x1e,
+	0x74, 0x4e, 0x47, 0xfc, 0x6c, 0xc4, 0x1d, 0x10, 0x24, 0xdf, 0x61, 0x54, 0x6e, 0xac, 0x60, 0xd1,
+	0x94, 0x42, 0x9b, 0xac, 0x58, 0xcc, 0x8a, 0xea, 0xb8, 0x62, 0x8f, 0x4c, 0x0c, 0xfb, 0x14, 0x36,
+	0x4a, 0xad, 0xe6, 0xd2, 0x54, 0x16, 0x6e, 0xf3, 0xee, 0x2d, 0x38, 0x31, 0x38, 0x39, 0x64, 0x31,
+	0x57, 0xa9, 0x37, 0x69, 0x90, 0x09, 0x54, 0xd0, 0xc4, 0xb0, 0xc7, 0xd0, 0xb5, 0x5a, 0x14, 0xa6,
+	0x54, 0xda, 0xa2, 0x45, 0x93, 0x2c, 0x3a, 0x37, 0xd8, 0xc4, 0x24, 0x7f, 0x0f, 0xa0, 0x45, 0x7d,
+	0x8c, 0x65, 0x60, 0x96, 0xe7, 0x2f, 0xe5, 0xdc, 0xfa, 0x93, 0xa8, 0x54, 0xf6, 0x09, 0xc4, 0x78,
+	0xca, 0xd9, 0x5c, 0xd8, 0x6a, 0xce, 0xdd, 0x02, 0x58, 0x5b, 0x8a, 0xec, 0x66, 0x99, 0x2b, 0xa0,
+	0x98, 0x47, 0x0e, 0x18, 0xa7, 0xec, 0x0b, 0xe8, 0x7a, 0xd2, 0xe5, 0xb0, 0x49, 0xb5, 0xe1, 0xc6,
+	0x07, 0xb5, 0x07, 0xef, 0x38, 0x9e, 0x14, 0xcc, 0x75, 0x2e, 0xce, 0x65, 0x5e, 0x0d, 0x2b, 0x52,
+	0xb0, 0x0c, 0x73, 0x51, 0x2c, 0xaa, 0x61, 0x85, 0x32, 0x4b, 0xa0, 0x7d, 0x21, 0xe6, 0xd2, 0x9a,
+	0x7e, 0xb8, 0x36, 0x91, 0xbe, 0x46, 0x88, 0x7b, 0x26, 0xf9, 0x67, 0x1d, 0x5a, 0xee, 0xbb, 0x8f,
+	0x71, 0xc6, 0x5e, 0x88, 0x65, 0x4e, 0x7e, 0xb8, 0xf8, 0x8e, 0x6a, 0x38, 0x65, 0x09, 0x3c, 0x13,
+	0x39, 0x7b, 0x00, 0xf1, 0xf9, 0xca, 0x4a, 0x43, 0x06, 0x34, 0x84, 0x8f, 0x6a, 0x3c, 0x22, 0x08,
+	0xe9, 0x8f, 0x21, 0xcc, 0x0a, 0xb7, 0x1a, 0x63, 0x6c, 0x1c, 0xd5, 0x78, 0x3b, 0x2b, 0x68, 0xe5,
+	0x36, 0x44, 0xe7, 0x4a, 0xe5, 0xc4, 0x61, 0x7c, 0xd1, 0x51, 0x8d, 0x87, 0x88, 0xf8, 0x75, 0xc6,
+	0x6a, 0xe2, 0x5a, 0x7e, 0xd7, 0xb6, 0xb1, 0x1a, 0xa9, 0x47, 0x00, 0xa9, 0x5a, 0x9e, 0xe7, 0x92,
+	0x58, 0x0c, 0x2e, 0x38, 0xaa, 0xf1, 0xd8, 0x61, 0x7e, 0xed, 0x42, 0x2a, 0x62, 0x43, 0xef, 0x50,
+	0x7b, 0x21, 0x95, 0xdf, 0x33, 0x15, 0xd6, 0xad, 0x8c, 0x3c, 0x17, 0x22, 0x82, 0xe4, 0xa7, 0xd0,
+	0x45, 0xd1, 0x66, 0xaf, 0x9d, 0x41, 0xec, 0x0d, 0x3a, 0x15, 0xea, 0x8d, 0x4a, 0x61, 0xcc, 0x95,
+	0xd2, 0x29, 0x19, 0x81, 0xf7, 0xae, 0x53, 0xa1, 0xde, 0x83, 0x65, 0xe6, 0xf8, 0x0e, 0xd6, 0x0e,
+	0x7a, 0xb0, 0xcc, 0x90, 0xda, 0x6f, 0x41, 0xe3, 0x52, 0xe4, 0xc9, 0x9f, 0x03, 0x68, 0x51, 0xd6,
+	0xff, 0xdb, 0xdd, 0xd8, 0xf5, 0x9d, 0xc3, 0xbe, 0x80, 0xe8, 0x52, 0xe4, 0x33, 0xbb, 0x2a, 0x25,
+	0xa5, 0x72, 0x73, 0x8f, 0xdd, 0x9e, 0x1d, 0x16, 0xc5, 0x74, 0x55, 0x4a, 0x1e, 0x5e, 0x3a, 0x01,
+	0xa7, 0xbb, 0x55, 0xaf, 0x64, 0x51, 0x4d, 0x21, 0xaf, 0xe1, 0xc7, 0x45, 0x9e, 0x09, 0x53, 0x95,
+	0x0a, 0x29, 0xc9, 0x10, 0x42, 0xff, 0x05, 0x06, 0xd0, 0x3e, 0x9d, 0xf2, 0xf1, 0xe4, 0x97, 0x6e,
+	0xde, 0x8e, 0x27, 0xd3, 0x5e, 0xc0, 0x62, 0x68, 0x7d, 0x7d, 0x7c, 0x32, 0x9c, 0xba, 0x81, 0xbb,
+	0x7f, 0x72, 0x72, 0xdc, 0x6b, 0xb0, 0x2e, 0x44, 0x87, 0xc3, 0xe9, 0x68, 0x3a, 0xfe, 0x06, 0x87,
+	0xee, 0x75, 0x00, 0x70, 0xfb, 0xc6, 0xb9, 0x5b, 0xfc, 0xc1, 0xbb, 0xc5, 0xcf, 0xa0, 0x49, 0x81,
+	0xb8, 0xae, 0x20, 0x19, 0x3d, 0xa3, 0xab, 0xcc, 0x4f, 0x53, 0xa7, 0xe0, 0x77, 0xc8, 0xf3, 0xec,
+	0x37, 0x52, 0xfb, 0x50, 0x6e, 0x01, 0x6c, 0x3e, 0x2d, 0x2f, 0xa5, 0x36, 0xee, 0x02, 0x89, 0x78,
+	0xa5, 0xe2, 0xd7, 0xe6, 0x6a, 0x59, 0x58, 0x2a, 0x90, 0x88, 0x3b, 0x85, 0x5a, 0x22, 0x33, 0x96,
+	0xea, 0x22, 0xe2, 0x24, 0x63, 0xa6, 0x96, 0xa5, 0x91, 0xda, 0x52, 0x45, 0x44, 0xdc, 0x6b, 0x37,
+	0xed, 0x13, 0x7b, 0x5b, 0x51, 0x2c, 0x92, 0x05, 0x74, 0x8f, 0xd5, 0x02, 0xc7, 0xa2, 0x7b, 0x08,
+	0xe3, 0x5a, 0x23, 0x75, 0x96, 0x56, 0x77, 0xa8, 0xd3, 0xd8, 0x16, 0x44, 0x55, 0x3d, 0x54, 0x57,
+	0x68, 0xa5, 0xe3, 0x8c, 0xd2, 0xf2, 0x42, 0x4b, 0xf3, 0x62, 0x46, 0x81, 0xf8, 0xe6, 0xef, 0x7a,
+	0x70, 0x8a, 0x58, 0x32, 0x82, 0xc6, 0xb3, 0x2b, 0x8b, 0xe3, 0x4e, 0xcc, 0x71, 0x72, 0xcd, 0x5e,
+	0x5e, 0x55, 0xf3, 0x25, 0x76, 0x08, 0xd2, 0x8f, 0xa0, 0x53, 0x7d, 0x0a, 0x79, 0xb7, 0x13, 0x78,
+	0xe8, 0xd9, 0x95, 0xdd, 0xfb, 0xae, 0x0e, 0xed, 0xc3, 0x85, 0x16, 0xe5, 0x0b, 0xf6, 0x14, 0x5a,
+	0xe4, 0x3a, 0xfb, 0x81, 0x9b, 0xed, 0x6b, 0x61, 0x6c, 0x6d, 0xf8, 0xb7, 0xba, 0x7b, 0xd4, 0x26,
+	0x35, 0xf6, 0x19, 0xb4, 0xbe, 0xa5, 0x07, 0x4f, 0x77, 0xfd, 0x15, 0xff, 0x7d, 0xbb, 0x5d, 0x68,
+	0xd3, 0x5b, 0x4d, 0x32, 0x47, 0x55, 0x0f, 0x37, 0x6f, 0x59, 0x3d, 0x38, 0x93, 0x1a, 0x7b, 0x02,
+	0xad, 0x61, 0x6e, 0xa5, 0x66, 0x9b, 0x77, 0x5f, 0x05, 0x5b, 0x6e, 0x07, 0x7f, 0x5f, 0x27, 0x35,
+	0xf6, 0x25, 0x6c, 0x1c, 0xd0, 0x15, 0x7b, 0xa2, 0x87, 0x78, 0x9f, 0xb2, 0x77, 0xdf, 0xa2, 0x5b,
+	0xef, 0x02, 0x49, 0x8d, 0x7d, 0x0e, 0x5d, 0xba, 0x1e, 0xab, 0xab, 0xd1, 0x8d, 0x35, 0x82, 0xfc,
+	0x06, 0x9e, 0x49, 0x6a, 0xfb, 0xbb, 0x7f, 0xba, 0x7e, 0x18, 0xfc, 0xe5, 0xfa, 0x61, 0xf0, 0x8f,
+	0xeb, 0x87, 0xc1, 0xef, 0xff, 0xf5, 0xb0, 0x06, 0x71, 0xa6, 0x06, 0x29, 0x65, 0x69, 0xbf, 0xe3,
+	0xb2, 0xf5, 0x1c, 0xff, 0xf7, 0x9c, 0xb7, 0xe9, 0xef, 0xcf, 0x97, 0xff, 0x09, 0x00, 0x00, 0xff,
+	0xff, 0x0c, 0xdf, 0xc0, 0xae, 0x0b, 0x0d, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -2385,6 +2394,13 @@ func (m *Mutation) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 			dAtA[i] = 0x52
 		}
 	}
+	if len(m.Cond) > 0 {
+		i -= len(m.Cond)
+		copy(dAtA[i:], m.Cond)
+		i = encodeVarintApi(dAtA, i, uint64(len(m.Cond)))
+		i--
+		dAtA[i] = 0x32
+	}
 	if len(m.Query) > 0 {
 		i -= len(m.Query)
 		copy(dAtA[i:], m.Query)
@@ -3418,6 +3434,10 @@ func (m *Mutation) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovApi(uint64(l))
 	}
+	l = len(m.Cond)
+	if l > 0 {
+		n += 1 + l + sovApi(uint64(l))
+	}
 	if len(m.Set) > 0 {
 		for _, e := range m.Set {
 			l = e.Size()
@@ -4853,6 +4873,38 @@ func (m *Mutation) Unmarshal(dAtA []byte) error {
 			}
 			m.Query = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 6:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Cond", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowApi
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthApi
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthApi
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Cond = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		case 10:
 			if wireType != 2 {
 				return fmt.Errorf("proto: wrong wireType = %d for field Set", wireType)
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 3efa774a850..156e1ca9990 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -509,26 +509,26 @@
 		{
 			"checksumSHA1": "kKrPMMzl8wnZ8Ml1WGHcNO2X0cI=",
 			"path": "github.com/dgraph-io/dgo",
-			"revision": "3d281925f1d38f1c0428a8a447acb9375d190f78",
-			"revisionTime": "2019-08-01T00:43:48Z"
+			"revision": "3b57e1cfe339248e6533c15837c6925c96afddac",
+			"revisionTime": "2019-08-07T02:29:24Z"
 		},
 		{
-			"checksumSHA1": "fhrMMWddafarfjBrQay+geKj0SQ=",
+			"checksumSHA1": "qPsGsoFTZRG9sahD7zOvWQ37vjA=",
 			"path": "github.com/dgraph-io/dgo/protos/api",
-			"revision": "3d281925f1d38f1c0428a8a447acb9375d190f78",
-			"revisionTime": "2019-08-01T00:43:48Z"
+			"revision": "3b57e1cfe339248e6533c15837c6925c96afddac",
+			"revisionTime": "2019-08-07T02:29:24Z"
 		},
 		{
 			"checksumSHA1": "6J5Im9lklapzLqF+qbHiATHD9iQ=",
 			"path": "github.com/dgraph-io/dgo/x",
-			"revision": "3d281925f1d38f1c0428a8a447acb9375d190f78",
-			"revisionTime": "2019-08-01T00:43:48Z"
+			"revision": "3b57e1cfe339248e6533c15837c6925c96afddac",
+			"revisionTime": "2019-08-07T02:29:24Z"
 		},
 		{
 			"checksumSHA1": "YOS7SDK4NjeABDXH3c1Jr9OuQYo=",
 			"path": "github.com/dgraph-io/dgo/y",
-			"revision": "3d281925f1d38f1c0428a8a447acb9375d190f78",
-			"revisionTime": "2019-08-01T00:43:48Z"
+			"revision": "3b57e1cfe339248e6533c15837c6925c96afddac",
+			"revisionTime": "2019-08-07T02:29:24Z"
 		},
 		{
 			"checksumSHA1": "blOHP3HPYU+IeV6yWCalQuuM+zE=",