clause.Expression = s.Expression
	} else {
		clause.Expression = s
	}
}

// CommaExpression represents a group of expressions separated by commas.
type CommaExpression struct {
	Exprs []Expression
}

func (comma CommaExpression) Build(builder Builder) {
	for idx, expr := range comma.Exprs {
		if idx > 0 {
			_, _ = builder.WriteString(", ")
		}
		expr.Build(builder)
	}

			Optional:    true,
			Sensitive:   false,
		},
		config.HelpKV{
			Key:         Extensions,
			Description: `comma separated file extensions` + defaultHelpPostfix(Extensions),
			Optional:    true,
			Type:        "csv",
		},
		config.HelpKV{
			Key:         MimeTypes,
			Description: `comma separated wildcard mime-types` + defaultHelpPostfix(MimeTypes),
			Optional:    true,
			Type:        "csv",
		},

}

// Use a Scanner with a custom split function to parse a comma-separated
// list with an empty final value.
func ExampleScanner_emptyFinalToken() {
	// Comma-separated list; last entry is empty.
	const input = "1,2,3,4,"
	scanner := bufio.NewScanner(strings.NewReader(input))
	// Define a split function that separates on commas.
	onComma := func(data []byte, atEOF bool) (advance int, token []byte, err error) {

	// verbose generates verbose output.
	verbose bool
	// selectResources constrains the list of resources to compare to only the ones in this list, ignoring all others.
	// The format of each list item is :: and the items are comma separated. The * character represents wildcard selection.
	// e.g.
	// Deployment:istio-system:* - compare all deployments in istio-system namespace
	// Service:*:istio-pilot - compare Services called "istio-pilot" in all namespaces.

	logCmd.PersistentFlags().StringVar(&outputLogLevel, "level", outputLogLevel,
		"Comma-separated list of output logging level for scopes in the format of <scope>:<level>[,<scope>:<level>,...]. "+
			"Possible values for <level>: none, error, warn, info, debug")
	logCmd.PersistentFlags().StringVar(&stackTraceLevel, "stack-trace-level", stackTraceLevel,

	cmd.PersistentFlags().StringVar(&args.common.watchedNamespaces, "watchedNamespaces", constants.IstioSystemNamespace,
		"The namespaces the operator controller watches, could be namespace list separated by comma, eg. 'ns1,ns2'")
	cmd.PersistentFlags().StringVar(&args.common.operatorNamespace, "operatorNamespace", operatorDefaultNamespace, OperatorNamespaceHelpstr)

	var features []string
	for f, cmap := range featureCtx {
		if len(cmap) == len(contexts) {
			features = append(features, f)
			continue
		}
		comma := strings.Index(f, ",")
		for cname := range cmap {
			f2 := fmt.Sprintf("%s (%s)%s", f[:comma], cname, f[comma:])
			features = append(features, f2)
		}
	}

	bw := bufio.NewWriter(os.Stdout)
	defer bw.Flush()

	var required []string

			}
			columnValue = string(b)
		default:
			return fmt.Errorf("Cannot marshal unhandled type: %T", kv.Value)
		}
		csvRecord = append(csvRecord, columnValue)
	}

	w := csv.NewWriter(writer)
	w.Comma = opts.FieldDelimiter
	w.Quote = opts.Quote
	w.AlwaysQuote = opts.AlwaysQuote
	w.QuoteEscape = opts.QuoteEscape
	if err := w.Write(csvRecord); err != nil {
		return err
	}
	w.Flush()
	return w.Error()

	// operatorNamespace is the namespace the operator controller is installed into.
	operatorNamespace string
	// watchedNamespaces is the namespaces the operator controller watches, could be namespace list separated by comma.
	watchedNamespaces string
	// istioNamespace is deprecated, use watchedNamespaces instead.
	istioNamespace string
	// manifestsPath is a path to a charts and profiles directory in the local filesystem with a release tgz.

	return other
}

// WriteCSV - encodes to CSV data.
func (r *Record) WriteCSV(writer io.Writer, opts sql.WriteCSVOpts) error {
	w := csv.NewWriter(writer)
	w.Comma = opts.FieldDelimiter
	w.AlwaysQuote = opts.AlwaysQuote
	w.Quote = opts.Quote
	w.QuoteEscape = opts.QuoteEscape
	if err := w.Write(r.csvRecord); err != nil {
		return err
	}
	w.Flush()
	return w.Error()