v.24.3Improvement

Consider Lightweight Deleted Rows for Improved Part Merge Estimation

Official CH changelog text
Consider lightweight deleted rows when selecting parts to merge, so the disk size of the resulting part will be estimated better. #58223 (Zhuo Qiu).
Considers lightweight deleted rows when selecting parts to merge in ClickHouse to improve the accuracy of disk size estimation for resulting parts.

Why it matters

This feature addresses the issue of inaccurate disk size estimation during merges by taking into account lightweight deleted rows. It ensures better decisions during part merges, leading to optimized storage usage and improved merge efficiency.

How to use it

This feature is integrated into the part selection process automatically. Users do not need to enable it manually; it improves merge operations transparently when merging parts in ClickHouse.

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