Struct TextProjectionExpr 

pub struct TextProjectionExpr { /* private fields */ }

TextProjectionExpr

Shared narrow text-projection expression over one source field. This remains a terminal/projection helper, not a generic expression system. Literal slots preserve the exact shipped SQL text-function argument family.

Implementations

impl TextProjectionExpr

pub fn new(field: impl Into<String>, transform: TextProjectionTransform) -> Self

Build one no-literal text projection over a source field.

pub fn with_literal( field: impl Into<String>, transform: TextProjectionTransform, literal: impl FieldValue, ) -> Self

Build one text projection carrying one literal argument.

pub fn with_two_literals( field: impl Into<String>, transform: TextProjectionTransform, literal: impl FieldValue, literal2: impl FieldValue, ) -> Self

Build one text projection carrying two literal arguments.

pub const fn field(&self) -> &str

Borrow the source field name.

pub const fn transform(&self) -> TextProjectionTransform

Return the transform taxonomy for this projection expression.

pub const fn literal(&self) -> Option<&Value>

Borrow the first optional literal argument.

pub const fn literal2(&self) -> Option<&Value>

Borrow the second optional literal argument.

pub const fn literal3(&self) -> Option<&Value>

Borrow the third optional literal argument.

pub fn with_optional_literal(self, literal: Option<Value>) -> Self

Override the first optional literal argument.

pub fn with_optional_second_literal(self, literal: Option<Value>) -> Self

Override the second optional literal argument.

pub fn with_optional_third_literal(self, literal: Option<Value>) -> Self

Override the third optional literal argument.

pub fn sql_label(&self) -> String

Render the stable SQL-style output label for this projection.

pub fn apply_value(&self, value: Value) -> Result<Value, QueryError>

Apply this projection to one already-loaded scalar value.

Trait Implementations

impl Clone for TextProjectionExpr

fn clone(&self) -> TextProjectionExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for TextProjectionExpr

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

Formats the value using the given formatter.

impl PartialEq for TextProjectionExpr

fn eq(&self, other: &TextProjectionExpr) -> 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 Eq for TextProjectionExpr

impl StructuralPartialEq for TextProjectionExpr