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aggregator_funcs.go
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aggregator_funcs.go
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// Copyright 2016 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
//
// Author: Radu Berinde (radu@cockroachlabs.com)
package distsqlplan
import "github.com/cockroachdb/cockroach/pkg/sql/distsqlrun"
// DistAggregationInfo describes how we can best compute a distributed
// aggregation. If we have multiple sources of data, we first compute a function
// on each group ("local stage") and then we aggregate those results (final
// "stage").
type DistAggregationInfo struct {
LocalStage distsqlrun.AggregatorSpec_Func
FinalStage distsqlrun.AggregatorSpec_Func
// TODO(radu): in some cases (average, standard deviation, variance) we could
// benefit from multiple functions per stage plus an additional rendering stage.
}
// DistAggregationTable is DistAggregationInfo look-up table. Functions that
// don't have an entry in the table are not optimized with a local stage.
var DistAggregationTable = map[distsqlrun.AggregatorSpec_Func]DistAggregationInfo{
distsqlrun.AggregatorSpec_IDENT: {
LocalStage: distsqlrun.AggregatorSpec_IDENT,
FinalStage: distsqlrun.AggregatorSpec_IDENT,
},
distsqlrun.AggregatorSpec_BOOL_AND: {
LocalStage: distsqlrun.AggregatorSpec_BOOL_AND,
FinalStage: distsqlrun.AggregatorSpec_BOOL_AND,
},
distsqlrun.AggregatorSpec_BOOL_OR: {
LocalStage: distsqlrun.AggregatorSpec_BOOL_OR,
FinalStage: distsqlrun.AggregatorSpec_BOOL_OR,
},
distsqlrun.AggregatorSpec_COUNT: {
LocalStage: distsqlrun.AggregatorSpec_COUNT,
FinalStage: distsqlrun.AggregatorSpec_SUM_INT,
},
distsqlrun.AggregatorSpec_MAX: {
LocalStage: distsqlrun.AggregatorSpec_MAX,
FinalStage: distsqlrun.AggregatorSpec_MAX,
},
distsqlrun.AggregatorSpec_MIN: {
LocalStage: distsqlrun.AggregatorSpec_MIN,
FinalStage: distsqlrun.AggregatorSpec_MIN,
},
distsqlrun.AggregatorSpec_SUM: {
LocalStage: distsqlrun.AggregatorSpec_SUM,
FinalStage: distsqlrun.AggregatorSpec_SUM,
},
}