func (b *executorBuilder) buildTableDual(v *plan.TableDual) Executor {
e := &TableDualExec{fields: v.Fields()}
return b.buildFilter(e, v.FilterConditions)
}
func (b *executorBuilder) buildTableDual(v *plan.TableDual) Executor {
return &TableDualExec{schema: v.GetSchema()}
}