Enum Pattern 

pub enum Pattern {
    Node(NodePattern),
    Path(PathPattern),
    Quantified {
        pattern: Box<Pattern>,
        min: u32,
        max: Option<u32>,
        subpath_var: Option<String>,
        path_mode: Option<PathMode>,
        where_clause: Option<Expression>,
    },
    Union(Vec<Pattern>),
    MultisetUnion(Vec<Pattern>),
}

A graph pattern.

Variants

Node(NodePattern)

A node pattern.

Path(PathPattern)

An edge pattern connecting nodes.

Quantified

A quantified (parenthesized) path pattern: ((a)-[e]->(b)){2,5}.

Fields

pattern: Box<Pattern>

The inner subpattern to repeat.

min: u32

Minimum repetitions.

max: Option<u32>

Maximum repetitions (None = unbounded).

subpath_var: Option<String>

G048: Subpath variable declaration, e.g. (p = (a)-[e]->(b)){2,5}.

path_mode: Option<PathMode>

G049: Path mode prefix inside parenthesized pattern, e.g. (TRAIL (a)-[]->(b)){2,5}.

where_clause: Option<Expression>

G050: WHERE clause inside parenthesized pattern, e.g. ((a)-[e]->(b) WHERE e.w > 5){2,5}.

Union(Vec<Pattern>)

A union of alternative path patterns: (a)-[:T1]->(b) | (a)-[:T2]->(c). Set semantics: duplicates are removed.

MultisetUnion(Vec<Pattern>)

A multiset union of alternative path patterns: (a)-[:T1]->(b) |+| (a)-[:T2]->(c). Bag semantics: duplicates are preserved (G030).

Trait Implementations

impl Clone for Pattern

fn clone(&self) -> Pattern

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Pattern

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

Formats the value using the given formatter.