switch arg := arg.(type) {
			case string:
				tx.Statement.Selects = append(tx.Statement.Selects, arg)
			case []string:
				tx.Statement.Selects = append(tx.Statement.Selects, arg...)
			default:
				tx.AddError(fmt.Errorf("unsupported select args %v %v", query, args))
				return
			}
		}

		if clause, ok := tx.Statement.Clauses["SELECT"]; ok {
			clause.Expression = nil
			tx.Statement.Clauses["SELECT"] = clause

			bugLogIf(ctx, stream.AddError(err.Error()))
			return
		}
		encStream, err := stream.AddEncryptedStream("inspect.zip", nil)
		if err != nil {
			bugLogIf(ctx, stream.AddError(err.Error()))
			return
		}
		addErr = func(msg string) {
			inspectZipW.Close()
			encStream.Close()
			stream.AddError(msg)
		}
		defer encStream.Close()

     * This method is thread-safe and can be called from multiple crawler threads.
     *
     * @param msg the error message to add; ignored if null or blank
     */
    public static void addError(final String msg) {
        if (StringUtil.isNotBlank(msg)) {
            errors.offer(msg);
        }
    }

    /**
     * Command-line options container for the crawler application.