Function avoid_generate_duplicate_sort_keys

datafusion/expr/src/utils.rs:1443–1493

()

    #[test]
    fn avoid_generate_duplicate_sort_keys() -> Result<()> {
        let asc_or_desc = [true, false];
        let nulls_first_or_last = [true, false];
        let partition_by = &[col("age"), col("name"), col("created_at")];
        for asc_ in asc_or_desc {
            for nulls_first_ in nulls_first_or_last {
                let order_by = &[
                    Sort {
                        expr: col("age"),
                        asc: asc_,
                        nulls_first: nulls_first_,
                    },
                    Sort {
                        expr: col("name"),
                        asc: asc_,
                        nulls_first: nulls_first_,
                    },
                ];

                let expected = vec![
                    (
                        Sort {
                            expr: col("age"),
                            asc: asc_,
                            nulls_first: nulls_first_,
                        },
                        true,
                    ),
                    (
                        Sort {
                            expr: col("name"),
                            asc: asc_,
                            nulls_first: nulls_first_,
                        },
                        true,
                    ),
                    (
                        Sort {
                            expr: col("created_at"),
                            asc: true,
                            nulls_first: false,
                        },
                        true,
                    ),
                ];
                let result = generate_sort_key(partition_by, order_by)?;
                assert_eq!(expected, result);
            }
        }
        Ok(())
    }

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