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Posted to issues@iceberg.apache.org by "badalprasadsingh (via GitHub)" <gi...@apache.org> on 2026/08/12 09:41:09 UTC
[I] UpdateSchema: Apply() returns IdentifierFieldIDs in non-deterministic order, breaking Schema.Equals [iceberg-go]
badalprasadsingh opened a new issue, #1776:
URL: https://github.com/apache/iceberg-go/issues/1776
### Apache Iceberg version
main (development)
### Please describe the bug 🐞
Right now, `UpdateSchema.Apply()` builds the evolved schema's `IdentifierFieldIDs` by iterating `u.identifierFieldNames`, a Go map. Map iteration order is _randomized_, so the resulting slice ordering is non-deterministic.
`Schema.Equals` compares `IdentifierFieldIDs` positionally via `slices.Equal`, so two logically identical schemas (same identifier fields) can compare unequal across runs. This causes `BuildUpdates()` to register spurious duplicate schema versions and pollutes schema history.
Ideal Fix: sort `identifierFieldIDs`
### Contribution
Will raise a PR for the fix.
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Re: [I] UpdateSchema: Apply() returns IdentifierFieldIDs in non-deterministic order, breaking Schema.Equals [iceberg-go]
Posted by "zeroshade (via GitHub)" <gi...@apache.org>.
zeroshade closed issue #1776: UpdateSchema: Apply() returns IdentifierFieldIDs in non-deterministic order, breaking Schema.Equals
URL: https://github.com/apache/iceberg-go/issues/1776
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