jacobBaumbach commented on a change in pull request #9806:
URL: https://github.com/apache/arrow/pull/9806#discussion_r606825668
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File path: rust/datafusion/src/physical_plan/union.rs
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@@ -60,15 +60,31 @@ impl ExecutionPlan for UnionExec {
/// Output of the union is the combination of all output partitions of the
inputs
fn output_partitioning(&self) -> Partitioning {
- // Sums all the output partitions
- let num_partitions = self
- .inputs
+ let intial: Option<Partitioning> = None;
+ self.inputs
.iter()
- .map(|plan| plan.output_partitioning().partition_count())
- .sum();
- // TODO: this loses partitioning info in case of same partitioning
scheme (for example `Partitioning::Hash`)
- // https://issues.apache.org/jira/browse/ARROW-11991
- Partitioning::UnknownPartitioning(num_partitions)
+ .fold(intial, |acc, input| {
+ match (acc, input.output_partitioning()) {
+ (None, partition) => Some(partition),
+ (
+ Some(Partitioning::Hash(mut vector_acc, size_acc)),
+ Partitioning::Hash(vector, size),
+ ) => {
+ vector_acc.append(&mut vector.clone());
Review comment:
Just to make sure I am on the same page:
Two `Partitioning::Hash` may only be composed if they have the same
expression and number of partitions. If the two `Partitioning::Hash` differ in
expression and/or number of partitions then it becomes a `UnknownPartitioning`.
Correct?
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