Remi Dettai created ARROW-10368:
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Summary: [Rust][Datafusion] Make InMemoryScan work on iterators of
RecordBatch
Key: ARROW-10368
URL: https://issues.apache.org/jira/browse/ARROW-10368
Project: Apache Arrow
Issue Type: Improvement
Components: Rust, Rust - DataFusion
Reporter: Remi Dettai
Currently, InMemoryScan takes a Vec<Vec<RecordBatch>> as data.
- the outer Vec separates the partitions
- the inner Vec contains all the RecordBatch for one partition
The inner Vec is then converted into an iterator when the LogicalPlan is turned
into a PhysicalPlan.
I suggest that InMemoryScan should take Vec<Iter<RecordBatch>>. This would
make it possible to plug custom Scan implementations into datafusion without
the need to read them entirely into memory. It would still work pretty
seamlessly with Vec<Vec<RecordBatch>> that would just need a to be converted
with data.map(|x| x.iter()) first.
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