fix: no panic on empty partition in register_record_batches#1627
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kosiew merged 2 commits intoJul 14, 2026
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`register_record_batches` read the schema via unchecked `partitions.0[0][0]`, which panics when a partition contains no record batches (e.g. the batches of an empty pyarrow table, whose `to_batches()` returns `[]`). Take the schema from the first available batch across all partitions and return a clear error when there is none, mirroring the empty-table handling added for `from_arrow_table` in apache#613. A non-empty later partition now also works instead of panicking on an empty leading one. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
kosiew
approved these changes
Jul 13, 2026
- Use find_map(|p| p.first()) instead of flatten().next() to make the "first batch in any partition" intent clearer (per @kosiew). - Extend regression test to also assert the empty outer partition list case ([]) raises the same ValueError. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
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Which issue does this PR close?
Closes #1626 .
Rationale for this change
register_record_batchesread the schema via uncheckedpartitions.0[0][0], which panics when a partition contains no record batches (e.g. the batches of an empty pyarrow table, whoseto_batches()returns[]).What changes are included in this PR?
Take the schema from the first available batch across all partitions and return a clear error when there is none, mirroring the empty-table handling added for
from_arrow_tablein #613. A non-empty later partition now also works instead of panicking on an empty leading one.Are there any user-facing changes?
register_record_batches now raises a catchable Python Exception on empty input instead of aborting with a Rust panic