81 lines
2.0 KiB
Go
81 lines
2.0 KiB
Go
// Copyright 2019 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 ast
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import (
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"github.com/pingcap/tidb/parser/format"
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)
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var _ StmtNode = &IndexAdviseStmt{}
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// IndexAdviseStmt is used to advise indexes
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type IndexAdviseStmt struct {
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stmtNode
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IsLocal bool
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Path string
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MaxMinutes uint64
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MaxIndexNum *MaxIndexNumClause
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LinesInfo *LinesClause
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}
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// Restore implements Node Accept interface.
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func (n *IndexAdviseStmt) Restore(ctx *format.RestoreCtx) error {
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ctx.WriteKeyWord("INDEX ADVISE ")
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if n.IsLocal {
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ctx.WriteKeyWord("LOCAL ")
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}
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ctx.WriteKeyWord("INFILE ")
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ctx.WriteString(n.Path)
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if n.MaxMinutes != UnspecifiedSize {
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ctx.WriteKeyWord(" MAX_MINUTES ")
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ctx.WritePlainf("%d", n.MaxMinutes)
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}
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if n.MaxIndexNum != nil {
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n.MaxIndexNum.Restore(ctx)
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}
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n.LinesInfo.Restore(ctx)
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return nil
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}
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// Accept implements Node Accept interface.
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func (n *IndexAdviseStmt) Accept(v Visitor) (Node, bool) {
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newNode, skipChildren := v.Enter(n)
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if skipChildren {
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return v.Leave(newNode)
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}
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n = newNode.(*IndexAdviseStmt)
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return v.Leave(n)
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}
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// MaxIndexNumClause represents 'maximum number of indexes' clause in index advise statement.
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type MaxIndexNumClause struct {
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PerTable uint64
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PerDB uint64
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}
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// Restore for max index num clause
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func (n *MaxIndexNumClause) Restore(ctx *format.RestoreCtx) error {
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ctx.WriteKeyWord(" MAX_IDXNUM")
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if n.PerTable != UnspecifiedSize {
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ctx.WriteKeyWord(" PER_TABLE ")
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ctx.WritePlainf("%d", n.PerTable)
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}
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if n.PerDB != UnspecifiedSize {
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ctx.WriteKeyWord(" PER_DB ")
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ctx.WritePlainf("%d", n.PerDB)
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}
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return nil
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}
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