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: compression.go
    path of file: ./repos/clickhouse-go/examples/std
    
    the code of the file until where you have to start completion: // Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not
    
func CompressOpen() error {
	env, err := GetStdTestEnvironment()
	if err != nil {
		return err
	}
	// note compress=gzip&compress_level=5
	conn, err := sql.Open("clickhouse", fmt.Sprintf("http://%s:%d?username=%s&password=%s&compress=gzip&compress_level=5", env.Host, env.HttpPort, env.Username, env.Password))
	defer func() {
		conn.Exec("DROP TABLE example")
	}()
	conn.Exec("DROP TABLE IF EXISTS example")
	if _, err := conn.Exec(`
		CREATE TABLE example (
			  Col1 Array(String)
			, Col2 UInt64
		) Engine Memory
		`); err != nil {
		return err
	}
	scope, err := conn.Begin()
	if err != nil {
		return err
	}
	batch, err := scope.Prepare("INSERT INTO example")
	if err != nil {
		return err
	}
	for i := 0; i < 1000; i++ {
		if _, err := batch.Exec(
			[]string{strconv.Itoa(i), strconv.Itoa(i + 1), strconv.Itoa(i + 2), strconv.Itoa(i + 3)},
			uint64(i),
		); err != nil {
			return err
		}
	}
	if err := scope.Commit(); err != nil {
		return err
	}
	return nil
}