36 lines
1009 B
Go
36 lines
1009 B
Go
// Copyright 2017 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package aggregation
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import (
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"bytes"
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"fmt"
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)
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// ExplainAggFunc generates explain information for a aggregation function.
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func ExplainAggFunc(agg Aggregation) string {
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buffer := bytes.NewBufferString(fmt.Sprintf("%s(", agg.GetName()))
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if agg.IsDistinct() {
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buffer.WriteString("distinct ")
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}
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for i, arg := range agg.GetArgs() {
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buffer.WriteString(arg.ExplainInfo())
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if i+1 < len(agg.GetArgs()) {
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buffer.WriteString(", ")
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}
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}
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buffer.WriteString(")")
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return buffer.String()
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}
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