costas-db opened a new issue, #3826:
URL: https://github.com/apache/parquet-java/issues/3826
### Problem
Parquet column paths are component-based, but `ParquetFileWriter` stores
Bloom filters in a map keyed by `String.join(".", descriptor.getPath())`.
These distinct paths therefore collide:
```text
Top-level field named `a.b`: ["a.b"]
Nested field `b` in `a`: ["a", "b"]
```
When both columns have Bloom filters, the nested filter overwrites the
top-level filter under the shared `"a.b"` key. During footer serialization,
both columns can receive the nested column filter.
### Reproduction
A test writes disjoint values (`top-*` and `nested-*`) to the two string
columns and checks each footer Bloom filter for its own values.
Current result:
```text
Top-level field path ["a.b"] contains its own Bloom values: false
Nested field path ["a", "b"] contains its own Bloom values: true
```
Expected: both results are `true`.
### Affected code
- `ParquetFileWriter.writeColumnChunk`
- `ParquetFileWriter.serializeBloomFilters`
Similar dot-string path handling also exists in dictionary lookup and
row-group copying, but this issue includes a minimal Bloom-filter reproduction.
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