1 files changed, 49 insertions, 0 deletions
diff --git a/src/rocksdb/utilities/agg_merge/agg_merge.h b/src/rocksdb/utilities/agg_merge/agg_merge.h
new file mode 100644
index 000000000..00e58de08
--- /dev/null
+++ b/src/rocksdb/utilities/agg_merge/agg_merge.h
@@ -0,0 +1,49 @@
+//  Copyright (c) 2017-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+#include <algorithm>
+#include <cstddef>
+#include <memory>
+#include <unordered_map>
+
+#include "rocksdb/merge_operator.h"
+#include "rocksdb/slice.h"
+#include "rocksdb/utilities/agg_merge.h"
+#include "utilities/cassandra/cassandra_options.h"
+
+namespace ROCKSDB_NAMESPACE {
+class AggMergeOperator : public MergeOperator {
+ public:
+  explicit AggMergeOperator();
+
+  bool FullMergeV2(const MergeOperationInput& merge_in,
+                   MergeOperationOutput* merge_out) const override;
+
+  bool PartialMergeMulti(const Slice& key,
+                         const std::deque<Slice>& operand_list,
+                         std::string* new_value, Logger* logger) const override;
+
+  const char* Name() const override { return kClassName(); }
+  static const char* kClassName() { return "AggMergeOperator.v1"; }
+
+  bool AllowSingleOperand() const override { return true; }
+
+  bool ShouldMerge(const std::vector<Slice>&) const override { return false; }
+
+ private:
+  class Accumulator;
+
+  // Pack all merge operands into one value. This is called when aggregation
+  // fails. The existing values are preserved and returned so that users can
+  // debug the problem.
+  static void PackAllMergeOperands(const MergeOperationInput& merge_in,
+                                   MergeOperationOutput& merge_out);
+  static Accumulator& GetTLSAccumulator();
+};
+
+extern std::string EncodeAggFuncAndPayloadNoCheck(const Slice& function_name,
+                                                  const Slice& value);
+}  // namespace ROCKSDB_NAMESPACE