コード例 #1
0
ファイル: builder.go プロジェクト: AkihiroSuda/tidb
func (b *executorBuilder) buildIndexScan(v *plan.IndexScan) Executor {
	tbl, _ := b.is.TableByID(v.Table.ID)
	var idx *column.IndexedCol
	for _, val := range tbl.Indices() {
		if val.IndexInfo.Name.L == v.Index.Name.L {
			idx = val
			break
		}
	}
	e := &IndexScanExec{
		tbl:        tbl,
		idx:        idx,
		fields:     v.Fields(),
		ctx:        b.ctx,
		Desc:       v.Desc,
		valueTypes: make([]*types.FieldType, len(idx.Columns)),
	}

	for i, ic := range idx.Columns {
		col := tbl.Cols()[ic.Offset]
		e.valueTypes[i] = &col.FieldType
	}

	e.Ranges = make([]*IndexRangeExec, len(v.Ranges))
	for i, val := range v.Ranges {
		e.Ranges[i] = b.buildIndexRange(e, val)
	}
	return e
}
コード例 #2
0
ファイル: builder.go プロジェクト: astaxie/tidb
func (b *executorBuilder) buildIndexScan(v *plan.IndexScan) Executor {
	txn, err := b.ctx.GetTxn(false)
	if err != nil {
		b.err = err
		return nil
	}
	tbl, _ := b.is.TableByID(v.Table.ID)
	client := txn.GetClient()
	var memDB bool
	switch v.Fields()[0].DBName.L {
	case "information_schema", "performance_schema":
		memDB = true
	}
	if !memDB && client.SupportRequestType(kv.ReqTypeIndex, 0) && txn.IsReadOnly() {
		log.Debug("xapi select index")
		e := &XSelectIndexExec{
			table:     tbl,
			ctx:       b.ctx,
			indexPlan: v,
		}
		where := conditionsToPBExpression(v.FilterConditions...)
		if xapi.SupportExpression(client, where) {
			e.where = where
			return e
		}
		return b.buildFilter(e, v.FilterConditions)
	}
	var idx *column.IndexedCol
	for _, val := range tbl.Indices() {
		if val.IndexInfo.Name.L == v.Index.Name.L {
			idx = val
			break
		}
	}
	e := &IndexScanExec{
		tbl:        tbl,
		idx:        idx,
		fields:     v.Fields(),
		ctx:        b.ctx,
		Desc:       v.Desc,
		valueTypes: make([]*types.FieldType, len(idx.Columns)),
	}

	for i, ic := range idx.Columns {
		col := tbl.Cols()[ic.Offset]
		e.valueTypes[i] = &col.FieldType
	}

	e.Ranges = make([]*IndexRangeExec, len(v.Ranges))
	for i, val := range v.Ranges {
		e.Ranges[i] = b.buildIndexRange(e, val)
	}
	return b.buildFilter(e, v.FilterConditions)
}