Upgrade versions of vendored libs

vendor/github.com/cockroachdb/pebble/internal/base/comparer.go

@@ -66,6 +66,23 @@ type Separator func(dst, a, b []byte) []byte
 // key must be valid to pass to Compare.
 type Successor func(dst, a []byte) []byte
 
+// ImmediateSuccessor is invoked with a prefix key ([Split(a) == len(a)]) and
+// returns the smallest key that is larger than the given prefix a.
+// ImmediateSuccessor must return a prefix key k such that:
+//
+//   Split(k) == len(k) and Compare(k, a) > 0
+//
+// and there exists no representable k2 such that:
+//
+//   Split(k2) == len(k2) and Compare(k2, a) > 0 and Compare(k2, k) < 0
+//
+// As an example, an implementation built on the natural byte ordering using
+// bytes.Compare could append a `\0` to `a`.
+//
+// The dst parameter may be used to store the returned key, though it is valid
+// to pass nil. The returned key must be valid to pass to Compare.
+type ImmediateSuccessor func(dst, a []byte) []byte
+
 // Split returns the length of the prefix of the user key that corresponds to
 // the key portion of an MVCC encoding scheme to enable the use of prefix bloom
 // filters.
@@ -104,14 +121,15 @@ type Split func(a []byte) int
 // Comparer defines a total ordering over the space of []byte keys: a 'less
 // than' relationship.
 type Comparer struct {
-	Compare        Compare
-	Equal          Equal
-	AbbreviatedKey AbbreviatedKey
-	FormatKey      FormatKey
-	FormatValue    FormatValue
-	Separator      Separator
-	Split          Split
-	Successor      Successor
+	Compare            Compare
+	Equal              Equal
+	AbbreviatedKey     AbbreviatedKey
+	FormatKey          FormatKey
+	FormatValue        FormatValue
+	Separator          Separator
+	Split              Split
+	Successor          Successor
+	ImmediateSuccessor ImmediateSuccessor
 
 	// Name is the name of the comparer.
 	//
@@ -193,6 +211,10 @@ var DefaultComparer = &Comparer{
 		return append(dst, a...)
 	},
 
+	ImmediateSuccessor: func(dst, a []byte) (ret []byte) {
+		return append(append(dst, a...), 0x00)
+	},
+
 	// This name is part of the C++ Level-DB implementation's default file
 	// format, and should not be changed.
 	Name: "leveldb.BytewiseComparator",