forked from pingcap/parser
/
stats.go
executable file
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/
stats.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 ast
import (
"github.com/pingcap/errors"
. "github.com/pingcap/parser/format"
"github.com/pingcap/parser/model"
)
var (
_ StmtNode = &AnalyzeTableStmt{}
_ StmtNode = &DropStatsStmt{}
_ StmtNode = &LoadStatsStmt{}
)
// AnalyzeTableStmt is used to create table statistics.
type AnalyzeTableStmt struct {
stmtNode
TableNames []*TableName
PartitionNames []model.CIStr
IndexNames []model.CIStr
AnalyzeOpts []AnalyzeOpt
// IndexFlag is true when we only analyze indices for a table.
IndexFlag bool
Incremental bool
}
// AnalyzeOptType is the type for analyze options.
type AnalyzeOptionType int
// Analyze option types.
const (
AnalyzeOptNumBuckets = iota
AnalyzeOptNumTopN
AnalyzeOptCMSketchDepth
AnalyzeOptCMSketchWidth
AnalyzeOptNumSamples
)
// AnalyzeOptionString stores the string form of analyze options.
var AnalyzeOptionString = map[AnalyzeOptionType]string{
AnalyzeOptNumBuckets: "BUCKETS",
AnalyzeOptNumTopN: "TOPN",
AnalyzeOptCMSketchWidth: "CMSKETCH WIDTH",
AnalyzeOptCMSketchDepth: "CMSKETCH DEPTH",
AnalyzeOptNumSamples: "SAMPLES",
}
// AnalyzeOpt stores the analyze option type and value.
type AnalyzeOpt struct {
Type AnalyzeOptionType
Value uint64
}
// Restore implements Node interface.
func (n *AnalyzeTableStmt) Restore(ctx *RestoreCtx) error {
if n.Incremental {
ctx.WriteKeyWord("ANALYZE INCREMENTAL TABLE ")
} else {
ctx.WriteKeyWord("ANALYZE TABLE ")
}
for i, table := range n.TableNames {
if i != 0 {
ctx.WritePlain(",")
}
if err := table.Restore(ctx); err != nil {
return errors.Annotatef(err, "An error occurred while restore AnalyzeTableStmt.TableNames[%d]", i)
}
}
if len(n.PartitionNames) != 0 {
ctx.WriteKeyWord(" PARTITION ")
}
for i, partition := range n.PartitionNames {
if i != 0 {
ctx.WritePlain(",")
}
ctx.WriteName(partition.O)
}
if n.IndexFlag {
ctx.WriteKeyWord(" INDEX")
}
for i, index := range n.IndexNames {
if i != 0 {
ctx.WritePlain(",")
} else {
ctx.WritePlain(" ")
}
ctx.WriteName(index.O)
}
if len(n.AnalyzeOpts) != 0 {
ctx.WriteKeyWord(" WITH")
for i, opt := range n.AnalyzeOpts {
if i != 0 {
ctx.WritePlain(",")
}
ctx.WritePlainf(" %d ", opt.Value)
ctx.WritePlain(AnalyzeOptionString[opt.Type])
}
}
return nil
}
// Accept implements Node Accept interface.
func (n *AnalyzeTableStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*AnalyzeTableStmt)
for i, val := range n.TableNames {
node, ok := val.Accept(v)
if !ok {
return n, false
}
n.TableNames[i] = node.(*TableName)
}
return v.Leave(n)
}
// DropStatsStmt is used to drop table statistics.
type DropStatsStmt struct {
stmtNode
Table *TableName
}
// Restore implements Node interface.
func (n *DropStatsStmt) Restore(ctx *RestoreCtx) error {
ctx.WriteKeyWord("DROP STATS ")
if err := n.Table.Restore(ctx); err != nil {
return errors.Annotate(err, "An error occurred while add table")
}
return nil
}
// Accept implements Node Accept interface.
func (n *DropStatsStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*DropStatsStmt)
node, ok := n.Table.Accept(v)
if !ok {
return n, false
}
n.Table = node.(*TableName)
return v.Leave(n)
}
// LoadStatsStmt is the statement node for loading statistic.
type LoadStatsStmt struct {
stmtNode
Path string
}
// Restore implements Node interface.
func (n *LoadStatsStmt) Restore(ctx *RestoreCtx) error {
ctx.WriteKeyWord("LOAD STATS ")
ctx.WriteString(n.Path)
return nil
}
// Accept implements Node Accept interface.
func (n *LoadStatsStmt) Accept(v Visitor) (Node, bool) {
newNode, skipChildren := v.Enter(n)
if skipChildren {
return v.Leave(newNode)
}
n = newNode.(*LoadStatsStmt)
return v.Leave(n)
}