Botond Dénes 7adbb1bd17 db/cache_mutation_reader: obtain gc-before and min-live-ts lazily ...

Obtaining the gc-before time, or the min-live timestamps (with the
expiry threshold) is not always trivial, so defer it until we know it is
needed. Not all reads will attempt to garbage-collect tombstones, these
reads can now avoid this work.
The downside is that the partition key has to be copied and stored, as
it is necessary for obtaining the min-live timestamp later.

2025-08-11 17:20:12 +03:00

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