[quinnj]

With strict=true, a column whose first value is NULL is typed by stepping ahead to a non-NULL row and then rewinding with sqlite3_reset + sqlite3_step. Rewinding re-runs the statement, so writes that return rows ran twice:

db = SQLite.DB()
DBInterface.execute(db, "CREATE TABLE t (id INTEGER PRIMARY KEY, a INT, b TEXT)")
stmt = DBInterface.prepare(db, "INSERT INTO t(a) VALUES (1),(2) RETURNING id, b")
DBInterface.execute(stmt, (); strict=true) |> columntable  # (id = [3, 4], b = [missing, missing])
DBInterface.execute(db, "SELECT count(*) AS n FROM t") |> columntable  # (n = [4],) -- 4 rows, not 2

UPDATE ... RETURNING likewise applied its update twice. #354 stopped the scan for statements that return no row; this covers writes that do return rows.

• Statements that write (sqlite3_stmt_readonly == 0) are no longer scanned. A column whose first value is NULL gets its declared type, or Any when it has none.
• Strict Any columns (for example a column declared BLOB) read every value as blob bytes, so an integer 1 came back as UInt8[0x31] and 'txt' as its bytes. Values in an Any column are now read by their own storage class, as non-strict queries already do.

Verification: two new testsets in "strict mode" (6 assertions fail on master, all pass here); full Pkg.test() passes locally on Julia 1.12 (SQLite 505/505 plus the lifetime, aggregate, BLOB and multi-statement sets).

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.77%. Comparing base (d3f97db) to head (82c7ac7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #370      +/-   ##
==========================================
+ Coverage   96.75%   96.77%   +0.02%     
==========================================
  Files           5        5              
  Lines         770      775       +5     
==========================================
+ Hits          745      750       +5     
  Misses         25       25              

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