Function compare_nested_arrow_arrays 

pub fn compare_nested_arrow_arrays(
    lhs: &dyn Array,
    rhs: &dyn Array,
    operator: CompareOperator,
) -> VortexResult<BooleanArray>

Compare two Arrow arrays element-wise using make_comparator.

This function is required for nested types (Struct, List, FixedSizeList) because Arrow’s vectorized comparison kernels (cmp::eq, cmp::neq, etc.) do not support them.

The vectorized kernels are faster but only work on primitive types, so for non-nested types, prefer using the vectorized kernels directly for better performance.