[WIP] Initial commit

vendor/github.com/cockroachdb/pebble/merger.go

@@ -0,0 +1,37 @@
+// Copyright 2018 The LevelDB-Go and Pebble Authors. All rights reserved. Use
+// of this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+package pebble
+
+import (
+	"io"
+
+	"github.com/cockroachdb/pebble/internal/base"
+)
+
+// Merge exports the base.Merge type.
+type Merge = base.Merge
+
+// Merger exports the base.Merger type.
+type Merger = base.Merger
+
+// ValueMerger exports the base.ValueMerger type.
+type ValueMerger = base.ValueMerger
+
+// DeletableValueMerger exports the base.DeletableValueMerger type.
+type DeletableValueMerger = base.DeletableValueMerger
+
+// DefaultMerger exports the base.DefaultMerger variable.
+var DefaultMerger = base.DefaultMerger
+
+func finishValueMerger(
+	valueMerger ValueMerger, includesBase bool,
+) (value []byte, needDelete bool, closer io.Closer, err error) {
+	if valueMerger2, ok := valueMerger.(DeletableValueMerger); ok {
+		value, needDelete, closer, err = valueMerger2.DeletableFinish(includesBase)
+	} else {
+		value, closer, err = valueMerger.Finish(includesBase)
+	}
+	return
+}