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avg_aggregator.go
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avg_aggregator.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package aggregator
import (
"github.com/shopspring/decimal"
)
import (
"github.com/arana-db/arana/pkg/proto"
)
type AvgAggregator struct {
sum decimal.NullDecimal
count decimal.NullDecimal
}
func (s *AvgAggregator) Aggregate(values []proto.Value) {
if len(values) < 2 {
return
}
if values[0] != nil {
val1, err := values[0].Decimal()
if err != nil {
panic(err.Error())
}
if !s.sum.Valid {
s.sum.Valid = true
s.sum.Decimal = decimal.Zero
}
s.sum.Decimal = s.sum.Decimal.Add(val1)
}
if values[1] != nil {
val, err := values[1].Decimal()
if err != nil {
panic(err.Error())
}
if !s.count.Valid {
s.count.Valid = true
s.count.Decimal = decimal.Zero
}
s.count.Decimal = s.count.Decimal.Add(val)
}
}
func (s *AvgAggregator) GetResult() (proto.Value, bool) {
if !s.sum.Valid || !s.count.Valid {
return nil, false
}
if s.count.Decimal.IsZero() {
return nil, false
}
result := s.sum.Decimal.Div(s.count.Decimal)
return proto.NewValueDecimal(result), true
}