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Variant field names not being ordered correctly via UTF-8 byte order

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难度
3/5
预计耗时
1-2 天
新手友好度
68/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
java

调研方向

从 VariantBuilder 和 Variant.getFieldByKey 开始,然后使用一个字段名位于补充平面的对象,并提供足够多的字段以触发二分查找,从而重现该问题。验证字段 ID 是否遵循 UTF-8 字节顺序,并验证对于由 parquet-java 和符合规范的 writers 生成的对象,查找都能成功。

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描述

Type: bug
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
U+E000..U+FFFF, whereas UTF-8 byte order (and the spec) orders them after. Consequences:

  • An object parquet-java builds with such keys has field ids sorted in an order that
    violates the spec.
  • A spec-compliant reader (e.g. the Apache Arrow C++/Rust/Go Variant readers) binary-searching
    that object can fail to find fields.
  • Conversely, parquet-java's own binary search fails to find a supplementary-plane key in an
    object produced by a spec-compliant writer.

The bug only surfaces when an object both contains a supplementary-plane key and is large
enough to take the binary-search path, so it has gone unnoticed.

Component(s)

Core

主要语言
Java
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