Enum FieldOp 

pub enum FieldOp {
    Field(FieldExpr),
    Cmp {
        op: OpQuery,
        lhs: Box<FieldOp>,
        rhs: Box<FieldOp>,
    },
}

Variants

Field(FieldExpr)

Cmp

Fields

op: OpQuery

lhs: Box<FieldOp>

rhs: Box<FieldOp>

Implementations

impl FieldOp

pub fn new(op: OpQuery, lhs: Self, rhs: Self) -> Self

pub fn cmp( field: impl Into<FieldName>, op: OpCmp, value: impl Into<AlgebraicValue>, ) -> Self

pub fn names_to_cols(self, head: &Header) -> Result<ColumnOp, RelationError>

pub fn flatten_ands(self) -> SmallVec<[FieldOp; 1]>

Flattens a nested conjunction of AND expressions.

For example, a = 1 AND b = 2 AND c = 3 becomes [a = 1, b = 2, c = 3].

This helps with splitting the kinds of queries, that could be answered by a index, from the ones that need to be executed with a scan.

Trait Implementations

impl Clone for FieldOp

fn clone(&self) -> FieldOp

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FieldOp

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

Formats the value using the given formatter.

impl Display for FieldOp

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

Formats the value using the given formatter.

impl From<FieldExpr> for FieldOp

fn from(original: FieldExpr) -> FieldOp

Converts to this type from the input type.

impl Hash for FieldOp

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for FieldOp

fn cmp(&self, other: &FieldOp) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for FieldOp

fn eq(&self, other: &FieldOp) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for FieldOp

fn partial_cmp(&self, other: &FieldOp) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for FieldOp

impl StructuralPartialEq for FieldOp