37 lines
995 B
Go
37 lines
995 B
Go
// Copyright 2017 PingCAP, Inc.
|
|
//
|
|
// 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,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package aggregation
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
)
|
|
|
|
// ExplainAggFunc generates explain information for a aggregation function.
|
|
func ExplainAggFunc(agg *AggFuncDesc) string {
|
|
var buffer bytes.Buffer
|
|
fmt.Fprintf(&buffer, "%s(", agg.Name)
|
|
if agg.HasDistinct {
|
|
buffer.WriteString("distinct ")
|
|
}
|
|
for i, arg := range agg.Args {
|
|
buffer.WriteString(arg.ExplainInfo())
|
|
if i+1 < len(agg.Args) {
|
|
buffer.WriteString(", ")
|
|
}
|
|
}
|
|
buffer.WriteString(")")
|
|
return buffer.String()
|
|
}
|