Module pattern_exists 

Vectorized EXISTS evaluation for pattern predicates in WHERE clauses.

When a WHERE clause contains a bare pattern predicate like (m)-[:SENT_BY]->(:Participant {name: $ename}), the parser wraps it in Expr::Exists { from_pattern_predicate: true }. Instead of running a full plan-and-execute cycle per row (the generic ExistsExecExpr path), this module evaluates the pattern using batch CSR neighbor lookups — the same approach used by PatternComprehensionExecExpr.

Returns a BooleanArray where each element indicates whether at least one matching path exists for that row’s anchor node.

Structs

PatternExistsExecExpr

Vectorized EXISTS expression for simple pattern predicates.

PropertyPredicate

A property equality predicate extracted from a node pattern’s property map.

Functions

extract_pattern_from_exists_query

Extracts the Pattern from a pattern-predicate Query.

extract_target_property_predicates

Extracts property predicates from target nodes in the pattern.