Trait datafusion_expr::expr_schema::ExprSchemable
source · [−]pub trait ExprSchemable {
fn get_type<S: ExprSchema>(&self, schema: &S) -> Result<DataType>;
fn nullable<S: ExprSchema>(&self, input_schema: &S) -> Result<bool>;
fn to_field(&self, input_schema: &DFSchema) -> Result<DFField>;
fn cast_to<S: ExprSchema>(
self,
cast_to_type: &DataType,
schema: &S
) -> Result<Expr>;
}
Expand description
trait to allow expr to typable with respect to a schema
Required Methods
given a schema, return the type of the expr
given a schema, return the nullability of the expr
convert to a field with respect to a schema