Strings

ClickHouse Packs Short Strings Into Hash Table Keys: No Allocation Per Key

Oct 21, 2026 14 min read Jay Hubbert

ClickHouse never stores a std::string in a hash table cell. It splits keys into size classes and packs strings of up to 24 bytes into plain integers, so your GROUP BY…

Clickhouse Internals Hash table Strings Performance

CPython's Template String Implementation in C (t-strings): Interpolation as Data

Oct 20, 2026 11 min read Jay Hubbert

t-strings produce a Template object — literal strings plus Interpolation objects — not a formatted string, so the pieces stay inspectable and reusable.

Python Cpython Internals Strings Template

CPython Interns Strings

Jan 22, 2026 6 min read Jay Hubbert

CPython keeps a global table of immortal static strings and a per-interpreter dict of mortal runtime ones, so equal strings can be compared by pointer.

Python Cpython Internals Performance Strings