alesapin

Concurrent `save_logical_snp_obj` and `create_snapshot`.

3

Hi! Seems like it's possible that NuRaft will concurrently run both methods (gdb trace https://gist.github.com/alesapin/973313f4d89f76634b4b1dd7e653e8ff). My code was node ready for this and I've got a deadlock :) Is it...

### Changelog category (leave one): - Not for changelog (changelog entry is not required) ### Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

### Changelog category (leave one): - Not for changelog (changelog entry is not required) ### Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Enable projections and zero copy replication

4

### Changelog category (leave one): - Improvement ### Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md): Now projections can be used with zero copy replication.

Flush StorageBuffer into multiple threads if num_layers > 1

1

### Changelog category (leave one): - Improvement ### Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md): Now if `StorageBuffer` has more than 1 shard (`num_layers`...

Make max_insert_delayed_streams_for_parallel_write actually work

4

### Changelog category (leave one): - Not for changelog (changelog entry is not required) ### Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Repro: https://s3.amazonaws.com/clickhouse-test-reports/63353/ff810ceb39a5a5942617bc453854dfc49c9cbb19/stress_test__asan_.html ``` ================================================================= ==3336==ERROR: AddressSanitizer: stack-use-after-return on address 0x7f8c3b1dd020 at pc 0x55ac4a9cad0f bp 0x7f8e0e1c5a10 sp 0x7f8e0e1c5a08 READ of size 16 at 0x7f8c3b1dd020 thread T799 (ThreadPool) #0 0x55ac4a9cad0e in std::__1::shared_ptr::shared_ptr[abi:v15000](std::__1::shared_ptr...

Expose `SimpleMergeSelector` settings via `MergeTreeSettings`

1

SimpleMergeSelector is an algorithm which ClickHouse use to choose parts for merges. This algorithm is not trivial and has multiple parameters (settings): https://github.com/ClickHouse/ClickHouse/blob/master/src/Storages/MergeTree/SimpleMergeSelector.h#L91-L153. These parameters are carefully selected to fit...

Properly support native copy for azure

1

### Changelog category (leave one): - Improvement ### Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md): Now backups with azure blob storage will use multicopy....

Logical error found by fuzzer `Inconsistent AST formatting: the query: ALTER TABLE enum_alter_issue MODIFY COLUMN` (related to Enum)

3

``` 2024.07.30 03:00:45.294456 [ 188 ] {3e92d4fd-fb5f-4e7f-8d07-7ba7e95cec0e} : Logical error: 'Inconsistent AST formatting: the query: ALTER TABLE enum_alter_issue MODIFY COLUMN `a` Enum8(equals(arrayExists(toNullable(18), range(arrayExists(range(toUInt256 % 10)), 51)), 'one', 1), 'two' =...