When I tried to add cool new clang-tidy 14 warnings, I noticed that the
current clang-tidy settings already produce a ton of warnings. This
commit addresses many of these. Almost all of them were non-critical,
i.e. C vs. C++ style casts.
CI found one hanged query [1], where the problem was that becase of
allow_experimental_parallel_reading_from_replicas the Cancel packet was
read by receivePartitionMergeTreeReadTaskResponseAssumeLocked() and so
the executor was not cancelled, while the code in
MergeTreeBaseSelectProcessor was not ready for this:
<details>
{
"is_initial_query": 0,
"elapsed": 1727.714379573,
"is_cancelled": 0,
"read_rows": "196577",
"read_bytes": "1179462",
"written_rows": "0",
"written_bytes": "0",
"query": "SELECT `CounterID`, `EventDate` FROM `test`.`hits` ORDER BY `CounterID` DESC, `EventDate` ASC LIMIT 50",
...
}
In logs:
2021.12.31 12:11:55.384735 [ 101532 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Debug> executeQuery: (from [::ffff:127.0.0.1]:58094, initial_query_id: e2966ca5-e836-44ef-8f8e-d1c1b32a>
2021.12.31 12:11:55.454379 [ 101532 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Trace> ContextAccess (default): Access granted: SELECT(EventDate, CounterID) ON test.hits
2021.12.31 12:11:55.457583 [ 101532 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Trace> datasets.hits_v1: Parallel reading from replicas enabled true
2021.12.31 12:11:55.459739 [ 101532 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Trace> InterpreterSelectQuery: FetchColumns -> WithMergeableStateAfterAggregationAndLimit
2021.12.31 12:11:55.471048 [ 101532 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Debug> datasets.hits_v1 (SelectExecutor): Key condition: unknown
2021.12.31 12:11:55.476514 [ 101532 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Debug> datasets.hits_v1 (SelectExecutor): MinMax index condition: unknown
2021.12.31 12:11:55.488302 [ 101532 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Debug> datasets.hits_v1 (SelectExecutor): Selected 2/2 parts by partition key, 2 parts by primary key, >
2021.12.31 12:11:55.494020 [ 101532 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Debug> MergeTreeReverseSelectProcessor: Reading 1 ranges in reverse order from part 201403_20_20_0, app>
2021.12.31 12:11:55.497644 [ 101532 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Debug> MergeTreeReverseSelectProcessor: Reading 138 ranges in reverse order from part 201403_19_19_2, a>
2021.12.31 12:11:55.536372 [ 170601 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Compact part, average mark size is 83886080
2021.12.31 12:11:55.558783 [ 171701 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Wide part, average mark size is 3069
2021.12.31 12:11:55.563960 [ 171701 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Wide part, average mark size is 3069
2021.12.31 12:11:55.577512 [ 171701 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Wide part, average mark size is 3069
2021.12.31 12:11:55.585660 [ 171701 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Wide part, average mark size is 3069
2021.12.31 12:11:55.613694 [ 170601 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Wide part, average mark size is 3069
2021.12.31 12:11:55.730597 [ 170601 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Wide part, average mark size is 3069
2021.12.31 12:11:55.743554 [ 171701 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Debug> MergingSortedTransform: Merge sorted 3 blocks, 65567 rows in 0.243999671 sec., 268717.5754429603>
2021.12.31 12:11:55.744196 [ 170601 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Wide part, average mark size is 3069
2021.12.31 12:11:55.890923 [ 170601 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Wide part, average mark size is 3069
2021.12.31 12:11:55.891222 [ 170601 ] {7e5f551e-5960-4fda-9447-9bfdae4660c1} <Test> MergeTreeBaseSelectProcessor: Reading from Wide part, average mark size is 3069
</details>
[1]: https://s3.amazonaws.com/clickhouse-test-reports/33341/0685fd99855bacd0bce02507c00a3bd7709eea61/stress_test__address__actions_.html
TODO (suggested by Nikolai)
1. Build query plan fro current query (inside storage::read) up to WithMergableState
2. Check, that plan is simple enough: Aggregating - Expression - Filter - ReadFromStorage (or simplier)
3. Check, that filter is the same as filter in projection, and also expression calculates the same aggregation keys as in projection
4. Return WithMergableState if projection applies
3 will be easier to do with ActionsDAG, cause it sees all functions, and dependencies are direct (but it is possible with ExpressionActions also)
Also need to figure out how prewhere works for projections, and
row_filter_policies.
wip
* master: (759 commits)
Suppress UBSan report in Decimal comparison
Suppress UBSan report in Decimal comparison
Fix UBSan report in arrayDifference
Update README.md
Non significant change in AggregationCommon
Print stack trace on SIGTRAP
Fix dependent test
Fix tests for better parallel run
Add test for already working code
Revert "Fix access control manager destruction order"
Update index.md
Update index.md
Update index.md
Bit more complicated example for isIPv4String - ru
Bit more complicated example for isIPv4String
cleanup
Replace database with ordinary
Added comments
Split tests to make them stable
Fixes
...
# Conflicts:
# src/Storages/MergeTree/MergeTreeRangeReader.cpp
