mingmwang opened a new issue, #3652:
URL: https://github.com/apache/arrow-datafusion/issues/3652
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One question about the implementation of this method, not sure my
understanding is correct or not.
The output order should be the join key after applying the sorting, why the
current implementation just return the left or right's output ordering? Does
the implementation already assume the left/right inputs are already sorted ?
````
fn output_ordering(&self) -> Option<&[PhysicalSortExpr]> {
match self.join_type {
JoinType::Inner | JoinType::Left | JoinType::Semi |
JoinType::Anti => {
self.left.output_ordering()
}
JoinType::Right => self.right.output_ordering(),
JoinType::Full => None,
}
}
````
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