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77 lines
2.6 KiB
77 lines
2.6 KiB
/*
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* Copyright 2019-2021 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// This file contains messages for representing the internal state and common
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// properties of aggregation algorithms, in a minimized and Lite Proto version
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// for Android.
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//
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// Messages defined in this file are often stored on disk, so reader libraries
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// should be able to parse all historic versions of the serialized data, and to
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// merge data with different serialization formats.
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syntax = "proto2";
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package zetasketch.android;
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option cc_enable_arenas = true;
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option optimize_for = LITE_RUNTIME;
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// Enumeration of all supported aggregation algorithms. Values should
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// start from 100.
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enum AggregatorType {
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reserved 0, 100 to 112, 114 to 140;
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// Computes approximate quantiles using the KLL algorithm.
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KLL_QUANTILES = 113;
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}
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// Never instantiated, just for scoping an enum and associated options.
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message DefaultOpsType {
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// Each value corresponds to a C++ type T.
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enum Id {
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UNKNOWN = 0;
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// SerializeToString uses varint encoding of the 2s complement.
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INT64 = 4;
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reserved 1 to 3, 5 to 20;
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}
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}
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// Serialized state of an aggregator.
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message AggregatorStateProto {
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// The type (= algorithm + implementation) of the aggregator.
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optional AggregatorType type = 1;
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optional int64 num_values = 2;
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// Version of the encoded internal state. On a per-aggregator basis, this
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// field is set to indicate that the format of the aggregator encoding has
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// changed such that the library has to decide how to decode.
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optional int32 encoding_version = 3 [default = 1];
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// Specifies the value type for the aggregation, e.g. INT64.
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//
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// For anything which is not a custom type, this will be a value of the
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// DefaultOpsType.Id enum.
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optional int32 value_type = 4;
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// An AggregatorStateProto message object has exactly one extension field set,
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// which holds the algorithm-specific state for the aggregator.
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extensions 100 to 112, 114 to 140;
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extensions 113 to 113; // reserved for KLL_QUANTILES.
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} |