presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/credential/file/ConfigFileBasedCredentialProviderConfig.java/ConfigFileBasedCredentialProviderConfig/setCredentialFile
class ConfigFileBasedCredentialProviderConfig:    @Config("connection-credential-file")
    @ConfigDescription("Location of the file where credentials are present")
    public ConfigFileBasedCredentialProviderConfig setCredentialFile(String connectionUser)
    {
        this.credentialsFile = connectionUser;
        return this;
    }