Struct DslExpr 

pub struct DslExpr(/* private fields */);

Typed traversal expression.

Implementations

impl DslExpr

pub fn src(field: impl Into<String>) -> Self

Reads a field from the source node of the candidate edge.

pub fn dest(field: impl Into<String>) -> Self

Reads a field from the destination node of the candidate edge.

pub fn edge(field: impl Into<String>) -> Self

Reads a field from the candidate edge.

pub fn state(field: impl Into<String>) -> Self

Reads a named value from the current path state.

pub fn src_id() -> Self

Reads the external source-node ID.

pub fn dest_id() -> Self

Reads the external destination-node ID.

pub fn edge_id() -> Self

Reads the external edge ID.

pub fn null_lit() -> Self

pub fn bool_lit(value: bool) -> Self

pub fn int_lit(value: i64) -> Self

pub fn uint_lit(value: u64) -> Self

pub fn float_lit(value: f64) -> Self

pub fn string_lit(value: impl Into<Arc<str>>) -> Self

pub fn lit(value: impl Into<Value>) -> Self

pub fn when(predicate: Self, truthy: Self, falsy: Self) -> Self

Returns truthy when predicate is true, otherwise falsy.

pub fn from_polars_json(json: &str) -> Result<Self>

Parses the supported Polars JSON expression subset.

pub fn and(self, rhs: Self) -> Self

pub fn or(self, rhs: Self) -> Self

pub fn eq(self, rhs: Self) -> Self

pub fn ne(self, rhs: Self) -> Self

pub fn lt(self, rhs: Self) -> Self

pub fn le(self, rhs: Self) -> Self

pub fn gt(self, rhs: Self) -> Self

pub fn ge(self, rhs: Self) -> Self

pub fn plus(self, rhs: Self) -> Self

pub fn minus(self, rhs: Self) -> Self

pub fn multiply(self, rhs: Self) -> Self

pub fn divide(self, rhs: Self) -> Self

Numeric division. Always returns Value::F64.

pub fn modulo(self, rhs: Self) -> Self

pub fn bit_and(self, rhs: Self) -> Self

pub fn bit_or(self, rhs: Self) -> Self

pub fn bit_xor(self, rhs: Self) -> Self

pub fn mask_if_any(self, mask: Self, then_value: Self) -> Self

Returns then_value when any bit in mask is set in self; otherwise returns 0.

pub fn not(self) -> Self

Boolean negation.

pub fn is_null(self) -> Self

pub fn is_not_null(self) -> Self

pub fn str_contains(self, needle: Self) -> Self

pub fn str_starts_with(self, prefix: Self) -> Self

pub fn str_ends_with(self, suffix: Self) -> Self

pub fn concat_list(values: impl IntoIterator<Item = Self>) -> Self

Concatenates list expressions, appending scalar expressions as single items.

Trait Implementations

impl Clone for DslExpr

fn clone(&self) -> DslExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DslExpr

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

Formats the value using the given formatter.