laskoviymishka commented on code in PR #2475:
URL: https://github.com/apache/iceberg-go/pull/2475#discussion_r4537063487


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website/src/releases.md:
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@@ -42,6 +42,8 @@ Per-release notes (highlights, breaking changes, 
contributors) are published on
 
 ### Unreleased compatibility notes
 
+- **Table creation rejects duplicate field IDs.** `CreateTable` and 
`NewMetadata` now return `ErrInvalidSchema` when two fields in the schema share 
an ID, including unset `0` or `-1` IDs, even for unpartitioned, unsorted 
tables. Before, the partition spec or sort order could bind to the wrong 
column. Callers should assign unique IDs (or let the schema be built with fresh 
IDs). This matches Java, whose `Schema` constructor rejects duplicate IDs.

Review Comment:
   REST `CreateTable` posts the schema to the server and never calls 
`NewMetadata` 
([rest.go](https://github.com/apache/iceberg-go/blob/3dfb417acf4006d92c41a0dd573e796550f9e7e9/catalog/rest/rest.go#L1663-L1700)),
 so for REST nothing changes on the client. Could the note scope this to 
catalogs that build metadata through `NewMetadata`?
   
   ```suggestion
   - **Table creation rejects duplicate field IDs.** `NewMetadata`, and 
`CreateTable` on catalogs that build metadata through it (not REST), now return 
`ErrInvalidSchema` when two fields in the schema share an ID, including unset 
`0` or `-1` IDs, even for unpartitioned, unsorted tables. Before, the partition 
spec or sort order could bind to the wrong column. Callers should assign unique 
IDs (or let the schema be built with fresh IDs). This matches Java, whose 
`Schema` constructor rejects duplicate IDs.
   ```



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