Struct ColumnExpr 

pub struct ColumnExpr {
    pub relation: Option<TableReference>,
    pub name: String,
}

A named reference to a qualified field in a schema.

Fields

relation: Option<TableReference>

relation/table reference.

name: String

field/column name.

Trait Implementations

impl Clone for ColumnExpr

fn clone(&self) -> ColumnExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnExpr

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

Formats the value using the given formatter.

impl Display for ColumnExpr

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

Formats the value using the given formatter.

impl ExprTrait for ColumnExpr

fn data_type(&self, input_schema: &Schema) -> QuillSQLResult<DataType>

Get the data type of this expression, given the schema of the input

fn nullable(&self, input_schema: &Schema) -> QuillSQLResult<bool>

Determine whether this expression is nullable, given the schema of the input

fn evaluate(&self, tuple: &Tuple) -> QuillSQLResult<ScalarValue>

Evaluate an expression against a Tuple

fn to_column(&self, input_schema: &Schema) -> QuillSQLResult<Column>

convert to a column with respect to a schema

impl Hash for ColumnExpr

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 ColumnExpr

fn cmp(&self, other: &ColumnExpr) -> 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 ColumnExpr

fn eq(&self, other: &ColumnExpr) -> 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 ColumnExpr

fn partial_cmp(&self, other: &ColumnExpr) -> 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 ColumnExpr

impl StructuralPartialEq for ColumnExpr