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public interface ResolvedExpression extends Expression {

    /**
     * Returns a string that fully serializes this instance. The serialized string can be used for
     * storing the query in, for example, a {@link org.apache.flink.table.catalog.Catalog} as a
     * view.
     *
     * @return detailed string for persisting in a catalog
     */
    default String asSerializableString() {
        throw new TableException(
                String.format(
                        "Expression '%s' is not string serializable. Currently, only expressions that "
                                + "originated from a SQL expression have a well-defined string representation.",
                        asSummaryString()));
    }
    
    ....
}

public interface QueryOperation extends Operation {

    /**
     * Returns a string that fully serializes this instance. The serialized string can be used for
     * storing the query in e.g. a {@link org.apache.flink.table.catalog.Catalog} as a view.
     *
     * @return detailed string for persisting in a catalog
     * @see Operation#asSummaryString()
     */
    default String asSerializableString() {
        throw new UnsupportedOperationException(
                "QueryOperations are not string serializable for now.");
    }
 ....   
}