Describe the bug
Several independent code paths in the Parquet reader scale poorly with column count, leading to catastrophic performance on wide schemas. This epic-like issue tracks the general problem; individual PRs will reference it for context.
To Reproduce
N/A
Expected behavior
Parquet reader/writer operations and Arrow structures (RecordBatch, etc.) should scale linearly (ideally sub-linearly) with column count wherever practical.
Additional context
Describe the bug
Several independent code paths in the Parquet reader scale poorly with column count, leading to catastrophic performance on wide schemas. This epic-like issue tracks the general problem; individual PRs will reference it for context.
To Reproduce
N/A
Expected behavior
Parquet reader/writer operations and Arrow structures (RecordBatch, etc.) should scale linearly (ideally sub-linearly) with column count wherever practical.
Additional context