sqlite: fix stale column count in StatementSync.all()

[araujogui]

If the schema changes after a statement is prepared, SQLite re-prepares it on the next sqlite3_step() call. StatementSync.prototype.all() reads the column count (sqlite3_column_count()) before that step, so on the first call after a schema change the count is stale.

const stmt = db.prepare('SELECT * FROM t'); // 2 columns
db.exec('ALTER TABLE t ADD COLUMN c'); // reprepare pending
stmt.all(); // stale count = 2

const stmt2 = db.prepare('SELECT * FROM t'); // 3 columns
db.exec('ALTER TABLE t DROP COLUMN c'); // reprepare pending
stmt2.all(); // stale count = 3

StatementSync.prototype.get() is unaffected because it reads the count after stepping.

[nodejs-github-bot]

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• @nodejs/sqlite

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/74486/ 💚

[araujogui]

@geeksilva97 are we good to land this?

[geeksilva97]

yes

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----------------------------------- PR info ------------------------------------
Title      sqlite: fix stale column count in StatementSync.all() (#64219)
Author     Guilherme Araújo <arauujogui@gmail.com> (@araujogui)
Branch     araujogui:sqlite-all-reprepare-num-cols -> nodejs:main
Labels     c++, author ready, commit-queue-squash, sqlite
Commits    2
 - sqlite: read column count after step in StatementSync.all()
 - sqlite: add schema-change regression tests
Committers 1
 - Guilherme Araújo <arauujogui@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/64219
Reviewed-By: Edy Silva <edigleyssonsilva@gmail.com>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/64219
Reviewed-By: Edy Silva <edigleyssonsilva@gmail.com>
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   ℹ  This PR was created on Tue, 30 Jun 2026 18:02:50 GMT
   ✔  Approvals: 1
   ✔  - Edy Silva (@geeksilva97): https://github.com/nodejs/node/pull/64219#pullrequestreview-4603550693
   ✘  This PR needs to wait 22 more hours to land (or 0 minutes if there is one more approval)
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