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Currently, the initial values of UDA accumulators are converted to strings using the to_string() method and from strings using the from_string() method. The from_string() method is not implemented for collections, and it can't be implemented without changing the string format, because in that format, we cannot differentiate whether a separator is a part of a value or is an actual separator between values. In particular, the separators are not escaped in the collection values. Instead of from_string()/to_string() the cql parser is used for creating a value from a string (the same , and to_parsable_string() is used to converting a value into a string. A test using a list as an accumulator is added to cql-pytest/test_uda.py. Signed-off-by: Wojciech Mitros <wojciech.mitros@scylladb.com> Closes #11250 * github.com:scylladb/scylladb: cql3: enable collections as UDA accumulators cql3: extend implementation of to_bytes for raw_value