You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: bigquery.go
    path of file: ./repos/cloudprober/contrib/gcp/bigquery
    
    the code of the file until where you have to start completion: // Copyright 2020 The Cloudprober Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable 
    
func Probe(ctx context.Context, r QueryRunner, table string) (string, error) {

	var metrics, result string
	var err error

	if table == "" {
		result, err = r.Query(ctx, "SELECT 1")
		metrics = fmt.Sprintf("%s %s", "bigquery_connect", result)
	} else {
		result, err = r.Query(ctx, "SELECT COUNT(*) FROM "+table)
		metrics = fmt.Sprintf("%s %s", "row_count", result)
	}

	if err != nil {
		return "", err
	}
	return metrics, nil
}