Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes into CHANGELOG.md):

Fixed logical errors in _row_number virtual column and iceberg positioned deletes.

• Made parquet reader v3 report row numbers (for iceberg positioned deletes and _row_number virtual column).
• _row_number virtual column was broken in a simple way and untested.
• IcebergStreamingPositionDeleteTransform expected the input chunks to arrive in order of increasing row number, but parquet readers didn't guarantee this. Made iceberg reader enable input_format_parquet_preserve_order if use_roaring_bitmap_iceberg_positional_deletes is false.
• To prevent the above from being slow, changed input_format_parquet_preserve_order implementation to not be slow. I previously planned to deprecate and delete it instead, but I guess we can't, since it's used in iceberg.
• Fixed parquet reader getting stuck on iceberg positioned deletes because of how the thread pool worked.
• Kind of fixed the progress bar for parquet reader v3. (It now works the same way as parquet reader v0, but that way is half broken.)
• Added a couple missing increments of profile events in parquet reader v3.