code: func (p *PhysicalIndexScan) IsPointGetByUniqueKey(sc *stmtctx.StatementContext) bool {
  	return len(p.Ranges) == 1 &&
  		p.Index.Unique &&
  		len(p.Ranges[0].LowVal) == len(p.Index.Columns) &&
  		p.Ranges[0].IsPoint(sc)
  }
docs: // IsPointGetByUniqueKey checks whether is a point get by unique key.