/
explain.go
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/
explain.go
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// 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 Aggregation) string {
buffer := bytes.NewBufferString(fmt.Sprintf("%s(", agg.GetName()))
if agg.IsDistinct() {
buffer.WriteString("distinct ")
}
for i, arg := range agg.GetArgs() {
buffer.WriteString(arg.ExplainInfo())
if i+1 < len(agg.GetArgs()) {
buffer.WriteString(", ")
}
}
buffer.WriteString(")")
return buffer.String()
}