uros7251brick opened a new issue, #3411:
URL: https://github.com/apache/parquet-java/issues/3411
### Describe the enhancement requested
## Description
Similar to how `getCurrentRowIndex()` was introduced to expose the current
row's file-level index, this adds `getCurrentRowGroupIndex()` to expose the
index of the row group currently being read.
## New API
- `ParquetFileReader.getCurrentRowGroupIndex()` — returns the 0-based index
of the last row group read via `readNextRowGroup() /
readNextFilteredRowGroup()`. Returns -1 before any row group has been read.
- `ParquetReader.getCurrentRowGroupIndex()` — same semantics, for the
high-level record reader.
- `ParquetRecordReader.getCurrentRowGroupIndex()` — same, for the Hadoop
MapReduce record reader.
The returned index is the actual file-level row group index, meaning it
correctly reflects gaps when empty row groups are skipped (e.g. if row group 1
is empty, the indices reported will be 0, 2, ... not 0, 1, ...).
## Motivation
Engines like Apache Spark need to know which row group a record belongs to —
for example, to expose row group metadata as a hidden column, or to correlate
records with row group-level statistics. Without this API, callers have no way
to determine the current row group index during sequential reads.
### Component(s)
_No response_
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