Пример #1
0
func (b *executorBuilder) buildNewTableScan(v *plan.NewTableScan) Executor {
	txn, err := b.ctx.GetTxn(false)
	if err != nil {
		b.err = err
		return nil
	}
	table, _ := b.is.TableByID(v.Table.ID)
	client := txn.GetClient()
	var memDB bool
	switch v.DBName.L {
	case "information_schema", "performance_schema":
		memDB = true
	}
	supportDesc := client.SupportRequestType(kv.ReqTypeSelect, kv.ReqSubTypeDesc)
	if !memDB && client.SupportRequestType(kv.ReqTypeSelect, 0) {
		// TODO: support union scan exec.
		return &NewTableScanExec{
			tableInfo:   v.Table,
			ctx:         b.ctx,
			supportDesc: supportDesc,
			asName:      v.TableAsName,
			table:       table,
			schema:      v.GetSchema(),
			Columns:     v.Columns,
			ranges:      v.Ranges,
		}
	}
	b.err = errors.New("Not implement yet.")
	return nil
}
Пример #2
0
func (b *executorBuilder) buildNewTableScan(v *plan.NewTableScan, s *plan.Selection) Executor {
	txn, err := b.ctx.GetTxn(false)
	if err != nil {
		b.err = err
		return nil
	}
	table, _ := b.is.TableByID(v.Table.ID)
	client := txn.GetClient()
	var memDB bool
	switch v.DBName.L {
	case "information_schema", "performance_schema":
		memDB = true
	}
	supportDesc := client.SupportRequestType(kv.ReqTypeSelect, kv.ReqSubTypeDesc)
	if !memDB && client.SupportRequestType(kv.ReqTypeSelect, 0) {
		var ret Executor
		st := &NewXSelectTableExec{
			tableInfo:   v.Table,
			ctx:         b.ctx,
			supportDesc: supportDesc,
			asName:      v.TableAsName,
			table:       table,
			schema:      v.GetSchema(),
			Columns:     v.Columns,
			ranges:      v.Ranges,
		}
		ret = st
		if !txn.IsReadOnly() {
			if s != nil {
				ret = b.buildNewUnionScanExec(ret,
					expression.ComposeCNFCondition(append(s.Conditions, v.AccessCondition...)))
			} else {
				ret = b.buildNewUnionScanExec(ret, nil)
			}
		}
		if s != nil {
			st.where, s.Conditions = b.toPBExpr(s.Conditions, st.tableInfo)
		}
		return ret
	}

	ts := &NewTableScanExec{
		t:          table,
		asName:     v.TableAsName,
		ctx:        b.ctx,
		columns:    v.Columns,
		schema:     v.GetSchema(),
		seekHandle: math.MinInt64,
		ranges:     v.Ranges,
	}
	if v.Desc {
		b.err = errors.New("Not implement yet.")
		return nil
	}
	return ts
}