code: func ResolveName(node ast.Node, info infoschema.InfoSchema, ctx context.Context) error {
  	defaultSchema := ctx.GetSessionVars().CurrentDB
  	resolver := nameResolver{Info: info, Ctx: ctx, DefaultSchema: model.NewCIStr(defaultSchema)}
  	node.Accept(&resolver)
  	return errors.Trace(resolver.Err)
  }
docs: // ResolveName resolves table name and column name.
  // It generates ResultFields for ResultSetNode and resolves ColumnNameExpr to a ResultField.