Andy Grove created ARROW-12253:
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Summary: [Rust] [Ballista] Implement scalable joins
Key: ARROW-12253
URL: https://issues.apache.org/jira/browse/ARROW-12253
Project: Apache Arrow
Issue Type: New Feature
Components: Rust - Ballista
Reporter: Andy Grove
Assignee: Andy Grove
Fix For: 5.0.0
The main issue limiting scalability in Ballista today is that joins are
implemented as hash joins where each partition of the probe side causes the
entire left side to be loaded into memory.
To make this scalable we need to hash partition left and right inputs so that
we can join the left and right partitions in parallel.
There is already work underway in DataFusion to implement this that we can
leverage.
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