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Nadav Har'El 3b32440993 test/cql-pytest: add regression test for UNSET key in insert

Recently, we overhauled the error handling of UNSET_VALUE in various
places where it is not allowed. This patch adds two more regression
tests for this error handling. Both tests pass on Scylla today, pass
on Cassandra, but fail on earlier Scylla (e.g., I tested 5.1.5):

The first test does INSERT into clustering key UNSET_VALUE.
An UNSET_VALUE is designed to skip part of the write - not an entire
write - so this attempt should fail - not silently be skipped.
The write indeed fails with an error on Cassandra, and on recent
Scylla, but silently did nothing in older Scylla which leads this
test to fail there.

The second test does the same thing with LWT (adding an "IF NOT EXISTS")
added to the insert. Scylla's failure here was even more spectacular -
it crashed (as reported in issue #13001) instead of silently skipping
the right. The test passes on Scylla today and on Cassandra, which
both report the failure cleanly.

Refs #13001.

Signed-off-by: Nadav Har'El <nyh@scylladb.com>

Closes #13007

2023-02-27 17:20:22 +02:00