Avro test fails on macOS

[yongtang]

The newly added Avro ops (#879) is not working well on macOS, and the tests in test_parse_avro_eager.py are triggering crashes.

This issue is for tracking the macOS fix.

Some additional notes:

• on macOS the GitHub CI passes optimization flag --copt=-msse4.2 --copt=-mavx --compilation_mode=opt
• linux is fine. Wondering if this is caused by certain buffer overflow due to the type difference?

/cc @burgerkingeater