alamb commented on a change in pull request #9695:
URL: https://github.com/apache/arrow/pull/9695#discussion_r595886251
##########
File path: rust/datafusion/src/logical_plan/builder.rs
##########
@@ -413,6 +436,32 @@ mod tests {
Ok(())
}
+ #[test]
+ fn plan_builder_union_combined_single_union() -> Result<()> {
+ let plan = LogicalPlanBuilder::scan_empty(
+ "employee.csv",
+ &employee_schema(),
+ Some(vec![3, 4]),
+ )?;
+
+ let plan = plan
+ .union(plan.build()?)?
+ .union(plan.build()?)?
+ .union(plan.build()?)?
+ .build()?;
+
+ // output has only one union
+ let expected = "Union\
Review comment:
👍
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