Ejemplo n.º 1
0
func (v *explainVisitor) explain(p plan.Plan) {
	switch x := p.(type) {
	case *plan.TableScan:
		v.entries = append(v.entries, v.newEntryForTableScan(x))
	case *plan.IndexScan:
		v.entries = append(v.entries, v.newEntryForIndexScan(x))
	case *plan.Sort:
		v.sort = true
	}

	for _, c := range p.GetChildren() {
		v.explain(c)
	}
}
Ejemplo n.º 2
0
func (e *ExplainExec) prepareExplainInfo(p plan.Plan, parent plan.Plan) error {
	for _, child := range p.GetChildren() {
		err := e.prepareExplainInfo(child, p)
		if err != nil {
			return errors.Trace(err)
		}
	}
	explain, err := json.MarshalIndent(p, "", "    ")
	if err != nil {
		return errors.Trace(err)
	}
	parentStr := ""
	if parent != nil {
		parentStr = parent.GetID()
	}
	row := &Row{
		Data: types.MakeDatums(p.GetID(), string(explain), parentStr),
	}
	e.rows = append(e.rows, row)
	return nil
}