Wojciech Mitros 48bd752971 cql3: enable collections as UDA accumulators ...

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. For example, a list with string elements:
'a, b', 'c' would be represented as a string 'a, b, c', while now
it is represented as "['a, b', 'c']".
Some types that were parsable are now represented in a different
way. For example, a tuple ('a', null, 0) was represented as
"a:\@:0", and now it is "('a', null, 0)".

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>

2022-08-11 16:23:57 +02:00

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