[thekevinbot]

Refs #1474

The CLI's JSON rows now read each cell as a rusqlite ValueRef (new pub(crate) query_each_ref on Db/DirSQL) and write text straight from SQLite's buffer, skipping the owned Value::Text copy. ASCII text with no control character, quote or backslash is copied verbatim (a branch-free, vectorizable check), skipping UTF-8 validation and serde's escape loop; everything else still goes through serde_json on the lossy string. The per-row cell Vec keeps its allocation across rows.

Side fix: text SQLite holds as invalid UTF-8 (e.g. CAST(x'ff41' AS TEXT)) panicked in fill_cell on main; it now prints with U+FFFD.

Timings

400k-file fixture, SELECT path FROM './**/*.md' (341,333 rows), --format json. Paired, interleaved hyperfine (-N -w1 -r5 per round, order alternating), medians:

base	before	after	after/before	fd --glob '*.md'	load (32 cores)
main	67.7 ms	64.3 ms	0.949	47.7 ms (1.42x -> 1.35x fd)	5.7
main + #1510	53.2 ms	50.8 ms	0.956	47.1 ms (1.13x -> 1.08x fd)	9.2

Re-measured on the final head (Range::contains form of the check), n=50, load 5.7: main 68.9 ms -> 65.2 ms (0.946), fd 47.6 ms; same as the pre-clippy build (0.985 head-to-head, within noise).

Output is byte-identical to main: md5 of 7 queries matched (the 400k tree, plus a fixture of escape-heavy names with quotes, backslashes, control chars, U+2028, emoji and non-UTF-8 bytes). The only difference is the 2 queries where main panics on non-UTF-8 text. Variants dropped because they measured neutral or worse: a hand-rolled escape loop, and a vectorized check that kept from_utf8. Allocating a fresh Vec per row instead of reusing one cost about 1.7 ms.

Manual run

$ dirsql query "SELECT CAST(x'ff41' AS TEXT) AS t" --format json
[{"t":"�A"}]

On main this panics with invalid UTF-8.

E2E Verification

• cargo test --workspace --features cli: 2028 passed, 0 failed
• Python e2e (impacted: query_contract, on_file_query, jsonl_parse_speed, all glob_speed_*), via testing-conventions e2e attest: 29 passed in 1498.65s; receipt committed
• TypeScript: just e2e-attest-ts: 18 passed; receipt committed
• New Rust CLI e2e packages/rust/tests/json_text_e2e.rs (non-UTF-8 text, escape-heavy text)

Changelog / Migrations

• packages/rust/changelog.d/2026-10-13-json-text-from-sqlite.md
• packages/rust/migrations.d/2026-10-13-json-text-from-sqlite.md
• No public SDK API change (query_each_ref is pub(crate)); PARITY.md untouched