28864184205
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main: 48%

Ran 07 Jul 2026 12:06PM UTC

Jobs 2

Files 252

Run time 1min

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Committed 07 Jul 2026 11:53AM UTC coverage: 47.665%. Remained the same

Build # 28864184205

Build Type

Pull #728

github

Committed by

sandonemaki

Commit Message

perf(gen): reuse the preload child scan buffer across rows

The generated <table>ScanMapperNullable allocated a fresh PreloadBuf with
new(...) inside its per-row before func, i.e. one heap allocation per parent
row (LEFT JOIN misses included). The buffer is pure scratch: before -> scan ->
after runs synchronously per row, scheduled columns are fully overwritten each
row, and unselected columns stay zero, so a single query-scoped buffer is
safe. Hoist it out of the before func and reuse it; the returned child is still
freshly allocated, so buf never escapes past after.

BenchmarkPreloadMapper/typed: -1 alloc per parent row (-17% B/op, ~-11% ns/op).

Keeps the hand-written testPreloadChildMapper in load_preload_test.go in sync
so TestPreloadMapperParity exercises the reused-buffer shape.

Pull Request Pull Request #728: perf(gen): reuse the preload child scan buffer across rows

Coverage Stats

11839 of 24838 relevant lines covered (47.66%)

721.79 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	go-stable - 28864184205.1	07 Jul 2026 12:08PM UTC	252	47.66	GitHub Action Run
2	go-oldstable - 28864184205.2	07 Jul 2026 12:06PM UTC	252	47.63	GitHub Action Run

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