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Rows returned by get(), all() and iterate() were created with Object::New() and a null prototype. That produces a dictionary-mode object with its own property dictionary for every row. Cache a DictionaryTemplate per statement, rebuilt when the statement is re-prepared, so rows get fast properties and share a map. Column names that DictionaryTemplate cannot represent keep using Object::New(): array indices, duplicates, and non-ASCII names, which it would intern as Latin-1. Assisted-by: Claude Code Signed-off-by: Guilherme Araújo <arauujogui@gmail.com>
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #66384 +/- ##
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+ Coverage 90.35% 90.36% +0.01%
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Files 792 792
Lines 275434 275477 +43
Branches 52781 52791 +10
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+ Hits 248868 248942 +74
+ Misses 16978 16939 -39
- Partials 9588 9596 +8
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all(),get()anditerate()built each row with theObject::New()overload that takes names and values. That overload always returns a dictionary-mode object, so no two rows shared a map and every property read was a hash lookup.Rows are now built from a
DictionaryTemplatecached on the statement and invalidated on re-prepare. Rows keep their null prototype. Statements whose column names a template can't express (array indices, duplicates, non-ASCII names, which the template interns as Latin-1) or with more than 64 columns keep the previous path.Adds
benchmark/sqlite/sqlite-prepare-select-read.js, which reads every column of each row, since the existing benchmarks only measure building rows.Fixes: #65799