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
1ab4c6aab3