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65 lines
1.8 KiB
65 lines
1.8 KiB
// 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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"github.com/pingcap/parser/ast"
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)
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// ExplainAggFunc generates explain information for a aggregation function.
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func ExplainAggFunc(agg *AggFuncDesc, normalized bool) string {
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var buffer bytes.Buffer
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fmt.Fprintf(&buffer, "%s(", agg.Name)
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if agg.HasDistinct {
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buffer.WriteString("distinct ")
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}
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for i, arg := range agg.Args {
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if agg.Name == ast.AggFuncGroupConcat && i == len(agg.Args)-1 {
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if len(agg.OrderByItems) > 0 {
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buffer.WriteString(" order by ")
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for i, item := range agg.OrderByItems {
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if item.Desc {
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if normalized {
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fmt.Fprintf(&buffer, "%s desc", item.Expr.ExplainNormalizedInfo())
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} else {
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fmt.Fprintf(&buffer, "%s desc", item.Expr.ExplainInfo())
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}
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} else {
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if normalized {
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fmt.Fprintf(&buffer, "%s asc", item.Expr.ExplainNormalizedInfo())
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} else {
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fmt.Fprintf(&buffer, "%s asc", item.Expr.ExplainInfo())
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}
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}
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if i+1 < len(agg.OrderByItems) {
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buffer.WriteString(", ")
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}
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}
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}
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buffer.WriteString(" separator ")
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} else if i != 0 {
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buffer.WriteString(", ")
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}
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if normalized {
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buffer.WriteString(arg.ExplainNormalizedInfo())
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} else {
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buffer.WriteString(arg.ExplainInfo())
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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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