Trait datafusion_common::ExprSchema

source · [−]
pub trait ExprSchema {
    fn nullable(&self, col: &Column) -> Result<bool>;

    fn data_type(&self, col: &Column) -> Result<&DataType>;
}
Expand description

Provides schema information needed by [Expr] methods such as [Expr::nullable] and [Expr::data_type].

Note that this trait is implemented for &DFSchema which is widely used in the DataFusion codebase.

Required methods

Is this column reference nullable?

What is the datatype of this column?

Implementors