Ravil Zakirov created IGNITE-28736:
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Summary: Preserve initial order of fields in
BinaryType#fieldNames()
Key: IGNITE-28736
URL: https://issues.apache.org/jira/browse/IGNITE-28736
Project: Ignite
Issue Type: Improvement
Components: binary
Reporter: Ravil Zakirov
h3. Description
Currently, the method `BinaryType#fieldNames()` returns a `Collection<String>`
without any guarantee of field order preservation. In practice, the order of
fields as defined in the original class or schema is often lost, as the
underlying implementation may use unordered collections (e.g., `HashSet`).
However, in various use cases — such as data export, schema introspection,
debugging, or integration with external systems — it is important to retain the
**original declaration order** of fields. This helps maintain predictability
and consistency, especially when field order has semantic meaning (e.g., in
CSV/JSON serialization, UI rendering, or compatibility with other binary
formats).
h3. Suggested Implementation
Ensure that during metadata registration in `BinaryTypeImpl` (or equivalent),
field names are stored in a `LinkedHashSet` to preserve insertion order, and
return them in that same order.
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