RQL has introduced a basic library of string functions that allow users to manipulate and group data flexibly, similar to MySQL's functionality. These functions include concat, concat_ws, lower, upper, left, right, substring, locate, length, and char_length, enabling operations such as extracting email domains to analyze event occurrences within a specified time frame. Users can now perform queries like identifying "email domains with the most events in the past hour" by employing these functions to slice and group data, enhancing RQL's data processing capabilities. For detailed usage, the RQL documentation provides further information on these functions.