mzzz-zzm commented on code in PR #1039:
URL: https://github.com/apache/iceberg-go/pull/1039#discussion_r3212404144
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manifest.go:
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@@ -944,6 +944,19 @@ func (v3writerImpl) prepareEntry(entry *manifestEntry,
snapshotID int64) (Manife
}
}
+ // v3 spec deprecates data_file.distinct_counts (parity with Java
+ // apache/iceberg#12182). Today none of the per-version Avro schemas in
+ // internal/avro_schemas.go declare distinct_counts, so the field is
+ // already dropped on encode for every version. This guard is
+ // forward-compatibility insurance: if the v2 schema is later fixed to
+ // declare distinct_counts (v2 spec requires it; tracked separately),
the
+ // v3 path stays compliant by clearing the Avro-facing pointer here. The
+ // cached distinctCntMap and DistinctValueCounts() getter are left alone
+ // so in-memory readers in the same process keep their view.
+ if df, ok := entry.DataFile().(*dataFile); ok {
Review Comment:
Fixed. The comment now calls this out explicitly:
```go
Best-effort: only the in-tree *dataFile is cleared; third-party DataFile
impls bypass this guard.
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