Struct CompressedFieldSizes 

pub struct CompressedFieldSizes { /* private fields */ }

Compressed sizes of a file’s fields, keyed by field path.

Sizes are derived from the file’s layout tree and segment map: walking the tree from the root, each physical segment is attributed to the deepest FieldPath whose layout subtree references it. A segment referenced by more than one field is attributed to their longest common ancestor, so a segment is counted exactly once and the size of a field always equals the sum of its child field sizes plus the bytes attributed directly to it (e.g. struct validity, or auxiliary segments such as zone maps and dictionaries written above the field split).

Fields nested inside non-struct types (e.g. structs within lists) are not split into separate layout subtrees by the writer, so their bytes are attributed to the enclosing field.

File-level metadata, alignment padding, and the footer are not part of any segment and are never attributed.

Implementations

impl CompressedFieldSizes

pub fn get(&self, path: &FieldPath) -> Option<u64>

Returns the compressed size in bytes of the field at the given path, including all of its descendants, or None if the layout tree contains no such field.

FieldPath::root returns the same value as total.

pub fn total(&self) -> u64

Returns the total compressed size in bytes of all segments referenced by the layout tree.

pub fn iter(&self) -> impl Iterator<Item = (&FieldPath, u64)>

Iterates over all field paths in the layout tree and their compressed sizes.

Trait Implementations

impl Clone for CompressedFieldSizes

fn clone(&self) -> CompressedFieldSizes

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for CompressedFieldSizes

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.