fallintoplace opened a new pull request, #1522:
URL: https://github.com/apache/iceberg-go/pull/1522

   ## Problem
   
   Glue table updates rebuild storage descriptor columns from Iceberg metadata. 
When a field has no Iceberg documentation, this replaces an existing Glue 
column comment with an empty value during otherwise unrelated commits.
   
   ## Changes
   
   - preserve existing Glue column comments by column name when the Iceberg 
field doc is empty
   - keep non-empty Iceberg field docs authoritative
   - use the first existing comment when old Glue columns contain duplicate 
names
   - safely handle tables without an existing storage descriptor
   
   ## Testing
   
   - `go test ./...`
   - `golangci-lint run --timeout=10m`
   


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