MapKey: print more concise error messages when check whether two map keys are duplicate

[wenchy]

Should check one sheet with all other sheets and print duplicate keys in two sheets with book and sheet name.

tableau/internal/confgen/parser.go

Lines 177 to 197 in e2dd85e

	// map-reduce: reduce results to one
	mainMsg := dynamicpb.NewMessage(info.MD) // treat the first one as main msg
	for i := 0; i < len(msgs); i++ {
	msg := msgs[i]
	err := xproto.Merge(mainMsg, msg.protomsg)
	if err != nil {
	if errors.Is(err, xproto.ErrDuplicateKey) {
	// find the already existed key before
	for j := 0; j < i; j++ {
	prevMsg := msgs[j]
	err := xproto.CheckMapDuplicateKey(prevMsg.protomsg, msg.protomsg)
	if err != nil {
	bookNames := prevMsg.bookName + ", " + msg.bookName
	return nil, xerrors.WrapKV(err,
	xerrors.KeyModule, xerrors.ModuleConf,
	xerrors.KeyBookName, bookNames,
	xerrors.KeySheetName, info.Opts.Name,
	xerrors.KeyPBMessage, string(info.MD.Name()))
	}
	}
	}