Kevin Dong 1f378c1b49 fix(python): preserve Decimal precision in table updates (#4431) ...

Python `Decimal` values and Arrow decimal scalars raise
`NotImplementedError` in `table.update(values=...)`. Register a Decimal
converter that emits quoted fixed-point text so the native cast to the
target column preserves every digit, including decimal128 and decimal256
values. Non-finite Decimal values raise `ValueError` with a static
message.

Closes #4360.

Validation with the native extension built from the current source at
7f593359, on macOS arm64 and Python 3.12.14:

- All 33 new regression cases failed before the fix and passed
afterward. They cover Python and Arrow scalar updates, signs, zero,
exponents, full 38/76-digit precision, and a Decimal context precision
of 6.
- 16 existing converter, update, and Decimal expression tests passed.
- Repository Ruff formatting and lint passed; formatting left all 156
files unchanged.
- A native round-trip check confirmed that an unquoted SQL number rounds
a high-precision value while the quoted Decimal update preserves it
exactly.

The full suite, other Python versions, and remote API were not
exercised.

AI assistance: Codex helped implement and validate the Decimal
conversion and its regression tests.

2026-10-09 16:51:56 -07:00

..

lancedb

fix(python): preserve Decimal precision in table updates (#4431)

2026-10-09 16:51:56 -07:00

tests

fix(python): preserve Decimal precision in table updates (#4431)

2026-10-09 16:51:56 -07:00

type_tests

fix(python): expose inline types to downstream checkers (#3817)

2026-08-07 17:31:42 +08:00