v.21.10Improvements

Use Real TMP File for Vertical Merges to Prevent Garbage Directories

Official CH changelog text
Use real tmp file instead of predefined "rows_sources" for vertical merges. This avoids generating garbage directories in tmp disks. #28299 (Amos Bird).
Use a real temporary file instead of a predefined "rows_sources" file for vertical merges in ClickHouse.

Why it matters

This change avoids the creation of unnecessary garbage directories in temporary disks during vertical merges, improving disk space management and system cleanliness.

How to use it

This feature is applied automatically in the new ClickHouse version with no additional user configuration required.

Related resources

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