Botond Dénes 46b795b5fd mutation: consume(): add reverse mode ...

`mutation::consume()` is used by range scans to convert the immediate
`reconcilable_result` to the final `query::result` format. When the
range scan is in reverse, `mutation::consume()` has to feed the
clustering fragments to the consumer in reverse order, but currently
`mutation::consume()` always uses the natural order, breaking reverse
range scans.
This patch fixes this by adding a `consume_in_reverse` parameter to
`mutation::consume()`, and consequently support for consuming clustering
fragments in reverse order.

Fixes: #8000

Tests: unit(release, debug),
dtest(thrift_tests.py:TestMutations.test_get_range_slice)

Signed-off-by: Botond Dénes <bdenes@scylladb.com>
Message-Id: <20210203081659.622424-1-bdenes@scylladb.com>

2021-02-03 11:00:47 +02:00

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