[python]Fix avro write timestamp without timezone wrongly

[discivigour]

Purpose

When fastavro writes timestamp without a timezone (such as pyarrow.timestamp('us')), the write and read results will differ by 8 hours.

This is because fastavro calculates the timestamp based on the local timezone (UTC+8) when writing no-timezone datetime data of the timestamp-millis logical type. It subtracts 8 hours when storing UTC timestamp, resulting in an 8-hour difference when reading.

Tests

test_py_write_read_pk_table()

API and Format

Documentation

Generative AI tooling

[JingsongLi]

+1