Module array_view 

ArrayView Module - Windowed View over an Array

ArrayV is a logical, read-only, zero-copy view into a contiguous window [offset .. offset + len) of any Array variant.

Purpose

• Provides indexable, bounds-checked access to a subrange of an array without copying buffers.
• Caches null counts per view for efficient repeated queries.
• Acts as a unifying abstraction for windowed operations across all array types.

Behaviour

• All indices are relative to the view’s start.
• Internally retains an Arc reference to the parent array’s buffers.
• Windowing and slicing are O(1) operations (pointer + metadata updates only).
• Cached null counts are stored in a Cell for fast repeated access.

Threading

• Not thread-safe due to Cell.
• For parallelism, create per-thread clones with slice.

Interop

• Convert back to a full array via to_array.
• Promote to (Array, offset, len) tuple with as_tuple.
• Access raw data pointer and element size via data_ptr_and_byte_len.

Invariants

• offset + len <= array.len()
• len reflects the logical number of elements in the view.

Structs

ArrayV

ArrayView