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max_aggregator.go
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/
max_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 MaxAggregator struct {
// max decimal.Decimal
max decimal.NullDecimal
}
func (s *MaxAggregator) Aggregate(values []proto.Value) {
if len(values) == 0 {
return
}
if values[0] == nil {
return
}
val, err := values[0].Decimal()
if err != nil {
panic(err.Error())
}
if !s.max.Valid {
s.max.Valid = true
s.max.Decimal = val
return
}
if s.max.Decimal.LessThan(val) {
s.max.Decimal = val
}
}
func (s *MaxAggregator) GetResult() (proto.Value, bool) {
if s.max.Valid {
return proto.NewValueDecimal(s.max.Decimal), true
}
return nil, false
}