rayokota opened a new issue, #3735:
URL: https://github.com/apache/parquet-java/issues/3735
### Describe the bug, including details regarding any error messages,
version, and platform.
The Variant spec requires the field ids in an object's header to be sorted
by the
**UTF-8 byte order** of the field names, so a reader can binary-search
them.
`VariantBuilder` sorted the fields — and `Variant.getFieldByKey`
binary-searched them —
using `String.compareTo`, which orders by **UTF-16 code units**, not UTF-8
bytes.
The two orderings are identical for all field names in the Basic
Multilingual Plane, but
they diverge for names containing supplementary-plane characters (U+10000
and above):
`String.compareTo` orders a leading high surrogate (0xD800–0xDBFF) before
code points in
### Component(s)
_No response_
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