LiuNeng

Why don't use gain ratio.

1

In wikipedia, C4.5 uses normalized information gain, not information gain.

Nearly 20% decompression performance degradation

17

I'm working on Clickhouse-based Backend for Project [Gluten](https://github.com/oap-project/gluten) and recently saw a significant performance degradation in the new version of ClickHouse when merging branches 22.3. # Performance Test About LZ4...

Support Date32 on dateTrunc and toStartOfInterval

2

### Changelog category (leave one): - Improvement ### Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md): Support Date32 on dateTrunc and toStartOfInterval ### Documentation entry...

[WIP] A new parquet reader that supports filter push down, which improves the total time on clickbench by 40+% compared to arrow parquet reader

1

I have seen many PRs that do optimization on parquet. Here I share a redesigned parquet reader that can currently achieve more than 40% performance improvement on clickbench. There are...

assert failed when use pread

1

https://[s3.amazonaws.com/clickhouse-test-reports/69862/331872a7e496cdd9d6420f989eb73d5aa5a1afee/stateless_tests__debug__s3_storage_/stderr.log](https://s3.amazonaws.com/clickhouse-test-reports/69862/331872a7e496cdd9d6420f989eb73d5aa5a1afee/stateless_tests__debug__s3_storage_/stderr.log) assertion will failed, when use pread