ArrowArrayStreamReader errors on zero-column record batches

[kylebarron]

#8944 introduced a regression in 57.2 that broke support for loading RecordBatches with zero columns through FFI.

This was a breaking change for record batches with zero columns. In kylebarron/arro3#475 I bumped package versions only, with no code changes on my side, and I now have two failing tests. This test newly errors with

Exception: Invalid argument error: must either specify a row count or at least one column

This is because the old code used RecordBatch::from(StructArray), which preserved the row count from the StructArray.

The new code uses RecordBatch::try_new, which discards the row count info when there are 0 columns.

Originally posted by @kylebarron in #8944 (comment)

[kylebarron]

kylebarron/arro3#476 is a minimal repro from a downstream library. Just bumping arrow-rs 57.1 to 57.2 causes the above-mentioned test failure on the CI run

[alamb]

We just released a bug fix release in

• Release arrow-rs / parquet Minor version 57.3.0 (January 2026) #9240

Do you think we should plan a 57.4.0 release (or 57.3.1 ?)

[kylebarron]

For me it's fine if the fix goes into 58.0. I don't need it urgently because there's nothing in 57.3+ that I need for the purposes of arro3

[jonded94]

Hey @kylebarron , sorry for the inconvenience. Have a look at #9405.