stephenafamo / bob
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LAST BUILD ON BRANCH spec-preload-dedup-cache
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coverage: 48.155% (+0.4%) from 47.707%
29178719639

Pull #736

github

sandonemaki 
feat(orm): add opt-in PreloadDedup to share preloaded to-one instances

JOIN-based preloading builds one related struct per parent row, even when
many parents reference the same related row. Add an opt-in PreloadDedup
option (orm.PreloadDedup, wrapped by psql/mysql/sqlite PreloadDedup) that
caches related structs per query execution keyed by the join columns, so
parent rows with the same key share a single instance — the same sharing
semantics as ThenLoad, without changing the emitted SQL.

With the reflection-based StructMapper the key is read from the scan
destinations before the struct is built, so duplicate rows skip
construction, nested preload AfterMods and Collect entirely. With a typed
PreloadMapper the link is opaque, so the key is read from the built value:
instances are still shared and collected once, but construction still runs.
A last-key fast path handles sorted results with a single comparison.

Dedup disables itself when the join key columns are not selected
(PreloadOnly/PreloadExcept), never caches unmatched LEFT JOIN rows, and
turns itself off after 1024 distinct keys without a single cache hit as a
safety valve for workloads with no duplication.
Pull Request #736: feat(orm): add opt-in PreloadDedup — share preloaded to-one instances across parent rows

208 of 265 new or added lines in 4 files covered. (78.49%)

8 existing lines in 1 file now uncovered.

12095 of 25117 relevant lines covered (48.15%)

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Relevant lines Covered
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29178719639 spec-preload-dedup-cache feat(orm): add opt-in PreloadDedup to share preloaded to-one instances JOIN-based preloading builds one related struct per parent row, even when many parents reference the same related row. Add an opt-in PreloadDedup option (orm.PreloadDedup, wra... Pull #736 sandonemaki github
48.15
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