Azat Khuzhin 10b4f3b41f Optimize queries with LIMIT/LIMIT BY/ORDER BY for distributed with GROUP BY sharding_key ... Previous set of QueryProcessingStage does not allow to do this. But after WithMergeableStateAfterAggregation had been introduced the following queries can be optimized too under optimize_distributed_group_by_sharding_key: - GROUP BY sharding_key LIMIT - GROUP BY sharding_key LIMIT BY - GROUP BY sharding_key ORDER BY And right now it is still not supports: - WITH TOTALS (looks like it can be supported) - WITH ROLLUP (looks like it can be supported) - WITH CUBE - SETTINGS extremes=1 (looks like it can be supported) But will be implemented separatelly. vX: fixes v2: fix WITH * v3: fix extremes v4: fix LIMIT OFFSET (and make a little bit cleaner) v5: fix HAVING v6: fix ORDER BY v7: rebase against 20.7 v8: move out WithMergeableStateAfterAggregation v9: add optimize_distributed_group_by_sharding_key into test names		2020-09-03 00:52:51 +03:00
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config	use Atomic for system database	2020-08-12 23:40:13 +03:00
external_models/catboost
fuzz
instructions
integration	Merge pull request #13987 from vitlibar/fix-grant-all-on-table	2020-09-02 05:06:32 +03:00
perf_drafts
performance	Merge pull request #14110 from 4ertus2/decimal	2020-08-31 17:08:49 +03:00
queries	Optimize queries with LIMIT/LIMIT BY/ORDER BY for distributed with GROUP BY sharding_key	2020-09-03 00:52:51 +03:00
testflows	Merge pull request #13987 from vitlibar/fix-grant-all-on-table	2020-09-02 05:06:32 +03:00
users.d
.gitignore
clickhouse-client.xml
clickhouse-test	Update clickhouse-test	2020-08-27 15:20:59 +03:00
clickhouse-test-server
client-test.xml
CMakeLists.txt
CTestCustom.cmake
decimals_dictionary.xml
ints_dictionary.xml
msan_suppressions.txt
server-test.xml
stress
strings_dictionary.xml
tsan_suppressions.txt
users.xml