thswlsqls opened a new issue, #17063:
URL: https://github.com/apache/iceberg/issues/17063
**Apache Iceberg version**
main @ 035fc1e40
**Query engine**
None — engine-agnostic, core variant shredding API
**Please describe the bug**
`ShreddedObject.put(field, value)` does not clear a prior `remove(field)`
marker, so after `remove()` then `put()` on the same field,
`get()`/`fieldNames()`/`numFields()` report the field as missing while
`writeTo()` still serializes it with the new value.
See `ShreddedObject.put(String, VariantValue)`
(`core/src/main/java/org/apache/iceberg/variants/ShreddedObject.java` line
92-100).
`get()` short-circuits on `removedFields.contains(field)` (line 102-106) and
`nameSet()` removes `removedFields` from the name set (line 64-74);
`SerializationState` builds its field list from `shreddedFields`, which `put()`
already updated.
**Steps to reproduce**
1. `ShreddedObject o = new ShreddedObject(metadata)`
2. `o.put("a", value1)`
3. `o.remove("a")` — `o.get("a")` returns `null`.
4. `o.put("a", value2)` — expected: `o.get("a")` returns `value2`.
Actual: `o.get("a")` still returns `null`, and
`o.numFields()`/`o.fieldNames()` exclude `"a"`.
5. `o.writeTo(buffer, 0)` — the serialized bytes contain `"a"` with
`value2`, contradicting step 4.
**Additional context**
Fix: clear the `removedFields` marker in `put()`.
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