"
This series adds some optimisations to the paging logic, that attempt to
close the performance gap between paged and not paged queries. The
former are more complex so always are going to be slower, but the
performance loss was unacceptably large.
Fixes#3619.
Performance with paging:
./perf_paging_before ./perf_paging_after diff
read 271246.13 312815.49 15.3%
Without paging:
./perf_nopaging_before ./perf_nopaging_after diff
read 343732.17 342575.77 -0.3%
Tests: unit(release), dtests(paging_test.py, paging_additional_test.py)
"
* tag 'optimise-paging/v1' of https://github.com/pdziepak/scylla:
cql3: select statement: don't copy metadata if not needed
cql3: query_options: make simple getter inlineable
cql3: metadata: avoid copying column information
query_pager: avoid visiting result_view if not needed
query::result_view: add get_last_partition_and_clustering_key()
query::result_reader: fix const correctness
tests/uuid: add more tests including make_randm_uuid()
utils: uuid: don't use std::random_device()
a4c9330bfc