liukun4515 commented on PR #5087:
URL:
https://github.com/apache/arrow-datafusion/pull/5087#issuecomment-1407276797
From the partition mode in the datafusion
```
/// Partitioning mode to use for hash join
pub enum PartitionMode {
/// Left/right children are partitioned using the left and right keys
Partitioned,
/// Left side will collected into one partition
CollectLeft,
/// When set to Auto, DataFusion optimizer will decide which
PartitionMode mode(Partitioned/CollectLeft) is optimal based on statistics.
/// It will also consider swapping the left and right inputs for the Join
Auto,
}
```
which is used in the hash join.
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