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Expr

risingwave_frontend::expr

Trait Expr 

Source 
pub trait Expr: Into<ExprImpl> {
    // Required methods
    fn return_type(&self) -> DataType;
    fn try_to_expr_proto(&self) -> Result<ExprNode, String>;

    // Provided methods
    fn to_expr_proto(&self) -> ExprNode { ... }
    fn to_expr_proto_checked_pure(
        &self,
        retract: bool,
        context: &str,
    ) -> Result<ExprNode>
       where Self: Clone { ... }
}
Expand description

the trait of bound expressions

Required Methods§

Source

fn return_type(&self) -> DataType

Get the return type of the expr

Source

fn try_to_expr_proto(&self) -> Result<ExprNode, String>

Try to serialize the expression, returning an error if it’s impossible.

Provided Methods§

Source

fn to_expr_proto(&self) -> ExprNode

Serialize the expression. Panic if it’s impossible.

Source

fn to_expr_proto_checked_pure( &self, retract: bool, context: &str, ) -> Result<ExprNode>
where Self: Clone,

Serialize the expression. Returns an error if this will result in an impure expression on a retract stream, which may lead to inconsistent results.

Dyn Compatibility§

This trait is not dyn compatible.

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

Implementors§