Trait ExpressionInfo 

pub trait ExpressionInfo:
    Debug
    + Sync
    + Send {
    // Required method
    fn return_type(&self) -> DataType;

    // Provided method
    fn input_ref_index(&self) -> Option<usize> { ... }
}

Common metadata of an expression.

Required Methods

fn return_type(&self) -> DataType

Get the return data type.

Provided Methods

fn input_ref_index(&self) -> Option<usize>

Get the index if the expression is an InputRef.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<'a, T: 'a + ExpressionInfo + ?Sized> ExpressionInfo for &'a T

where &'a T: Debug + Sync + Send,

fn return_type(&self) -> DataType

fn input_ref_index(&self) -> Option<usize>

impl<T: ExpressionInfo + ?Sized> ExpressionInfo for Arc<T>

where Arc<T>: Debug + Sync + Send,

fn return_type(&self) -> DataType

fn input_ref_index(&self) -> Option<usize>

impl<T: ExpressionInfo + ?Sized> ExpressionInfo for Box<T>

where Box<T>: Debug + Sync + Send,

fn return_type(&self) -> DataType

fn input_ref_index(&self) -> Option<usize>

Implementors

impl ExpressionInfo for BoxedExpression

impl ExpressionInfo for InputRefExpression

impl ExpressionInfo for LiteralExpression

impl ExpressionInfo for UserDefinedFunction

impl<E, R> ExpressionInfo for NonStrict<E, R>

where E: ExpressionInfo, R: EvalErrorReport,

impl<E: ExpressionInfo> ExpressionInfo for BinaryShortCircuitExpression<E>

impl<E: ExpressionInfo> ExpressionInfo for Checked<E>

impl<E: ExpressionInfo> ExpressionInfo for SomeAllExpression<E>

impl<E> ExpressionInfo for Strict<E>

where E: ExpressionInfo,