Module pattern_comprehension 

Vectorized pattern comprehension for Cypher [(a)-[:REL]->(b) WHERE pred | expr].

Implements a PhysicalExpr that:

1. Extracts anchor VIDs from the input batch
2. Expands neighbors via CSR adjacency (synchronous)
3. Materializes needed properties via block_in_place
4. Applies optional predicate filter
5. Evaluates the map expression
6. Reconstructs a LargeList column grouped by parent row

Structs

PatternComprehensionExecExpr

Physical expression for Cypher Pattern Comprehension: [(a)-[:REL]->(b) WHERE pred | expr]

TraversalStep

A single hop derived from the pattern’s elements.

Functions

analyze_pattern

Analyze a pattern to extract the anchor column and traversal steps.

build_inner_schema

Build the inner schema for the expanded batch.

collect_inner_properties

Collect property references from expressions that refer to inner variables.