fixed some bugs

Author: harshil-goel

go.mod

@@ -25,7 +25,6 @@ require (
 	github.com/golang-jwt/jwt/v5 v5.2.2
 	github.com/golang/geo v0.0.0-20250606134707-e8fe6a72b492
 	github.com/golang/glog v1.2.5
-	github.com/golang/protobuf v1.5.4
 	github.com/golang/snappy v1.0.0
 	github.com/google/codesearch v1.2.0
 	github.com/google/go-cmp v0.7.0
@@ -108,6 +107,7 @@ require (
 	github.com/goccy/go-json v0.10.5 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
 	github.com/google/flatbuffers v25.2.10+incompatible // indirect
 	github.com/google/pprof v0.0.0-20250423184734-337e5dd93bb4 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.26.3 // indirect

worker/task.go

@@ -2524,13 +2524,17 @@ func (qs *queryState) evaluate(cp countParams, out *pb.Result) error {
 
 func (qs *queryState) handleHasWithOrderFunction(ctx context.Context, q *pb.Query, out *pb.Result,
 	rev bool, offset, first int) error {
+	if first == 0 {
+		first = math.MaxInt
+	}
+
 	initKey := x.ParsedKey{
 		Attr: q.Attr,
 	}
 
 	startKey := x.IndexKey(q.Attr, "")
 	if rev {
-		startKey = x.IndexKey(q.Attr, "zzzzzzzzzzzzzzzzzzzzzzzzzzz")
+		startKey = x.IndexKeyAfterAllTerms(q.Attr)
 	}
 
 	prefix := initKey.IndexPrefix()

x/keys.go

@@ -231,6 +231,19 @@ func ReverseKey(attr string, uid uint64) []byte {
 	return buf
 }
 
+func IndexKeyAfterAllTerms(attr string) []byte {
+	// Use a term with 0xFF to ensure lexicographically after any real term
+	sentinelTerm := []byte{0xFF}
+	extra := 1 + len(sentinelTerm) // ByteIndex + 0xFF
+	buf, prefixLen := generateKey(DefaultPrefix, attr, extra)
+
+	rest := buf[prefixLen:]
+	rest[0] = ByteIndex
+	copy(rest[1:], sentinelTerm)
+
+	return buf
+}
+
 // IndexKey generates a index key with the given attribute and term.
 // The structure of an index key is as follows:
 //