Function prune_int32_is_null

datafusion/pruning/src/pruning_predicate.rs:4254–4290

()

    #[test]
    fn prune_int32_is_null() {
        let (schema, statistics) = int32_setup();

        // Expression "i IS NULL" when there are no null statistics,
        // should all be kept
        let expected_ret = &[true, true, true, true, true];

        prune_with_expr(
            // i IS NULL, no null statistics
            col("i").is_null(),
            &schema,
            &statistics,
            expected_ret,
        );

        // provide null counts for each column
        let statistics = statistics.with_null_counts(
            "i",
            vec![
                Some(0), // no nulls (don't keep)
                Some(1), // 1 null
                None,    // unknown nulls
                None, // unknown nulls (min/max are both null too, like no stats at all)
                Some(0), // 0 nulls (max=null too which means no known max) (don't keep)
            ],
        );

        let expected_ret = &[false, true, true, true, false];

        prune_with_expr(
            // i IS NULL, with actual null statistics
            col("i").is_null(),
            &schema,
            &statistics,
            expected_ret,
        );
    }

    #[test]
    fn prune_int32_column_is_known_all_null() {