Function plan_builder_union

datafusion/expr/src/logical_plan/builder.rs:2371–2393

()

    #[test]
    fn plan_builder_union() -> Result<()> {
        let plan =
            table_scan(Some("employee_csv"), &employee_schema(), Some(vec![3, 4]))?;

        let plan = plan
            .clone()
            .union(plan.clone().build()?)?
            .union(plan.clone().build()?)?
            .union(plan.build()?)?
            .build()?;

        assert_snapshot!(plan, @r"
        Union
          Union
            Union
              TableScan: employee_csv projection=[state, salary]
              TableScan: employee_csv projection=[state, salary]
            TableScan: employee_csv projection=[state, salary]
          TableScan: employee_csv projection=[state, salary]
        ");

        Ok(())
    }

    #[test]
    fn plan_builder_union_distinct() -> Result<()> {