HaoYang670 commented on code in PR #4753:
URL: https://github.com/apache/arrow-datafusion/pull/4753#discussion_r1058694733
##########
datafusion/core/src/physical_plan/planner.rs:
##########
@@ -773,12 +773,19 @@ impl DefaultPhysicalPlanner {
)?;
Ok(Arc::new(FilterExec::try_new(runtime_expr,
physical_input)?))
}
- LogicalPlan::Union(Union { inputs, .. }) => {
+ LogicalPlan::Union(Union { inputs, schema }) => {
let physical_plans = futures::stream::iter(inputs)
.then(|lp| self.create_initial_plan(lp, session_state))
.try_collect::<Vec<_>>()
.await?;
- Ok(Arc::new(UnionExec::new(physical_plans)))
+ if schema.fields().len() <
physical_plans[0].schema().fields().len() {
Review Comment:
The original implementation ignores the top level schema, but I don't know
why. (Maybe @gandronchik knows more about it). So I try to minimize the scope
of this change to avoid introducing new bugs.
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