Module lazy 

Lazy evaluation IR for TidyView.

A LazyView captures a chain of operations as a tree of ViewNodes. On .collect(), the tree is optimized by rule-based passes, then executed.

Determinism

• All plan transformations are pure, deterministic functions.
• No HashMap/HashSet usage – only Vec and BTreeSet for column tracking.
• Execution delegates to TidyView/TidyFrame methods which already guarantee deterministic output (Kahan summation, BTreeMap groups, stable sorts).

Structs

Batch

A chunk of up to BATCH_SIZE rows for vectorized processing.

LazyView

A lazy view that captures operations without executing them.

Enums

JoinType

The kind of join.

ViewNode

A node in the lazy evaluation tree.

Functions

execute_batched

Execute an optimized ViewNode tree using batch processing where possible.

optimize

Apply all optimization passes to a ViewNode tree.