func (r *JoinPlan) explainNode(w format.Formatter, node plan.Plan) {
sel := !isTableOrIndex(node)
if sel {
w.Format("┌Iterate all rows of virtual table\n")
}
node.Explain(w)
if sel {
w.Format("└Output field names %v\n", field.RFQNames(node.GetFields()))
}
}
