Trait datafusion_common::ExprSchema
source · pub trait ExprSchema: Debug {
// Required methods
fn nullable(&self, col: &Column) -> Result<bool>;
fn data_type(&self, col: &Column) -> Result<&DataType>;
}
Expand description
Provides schema information needed by certain methods of Expr
(defined in the datafusion-common crate).
Note that this trait is implemented for &DFSchema which is widely used in the DataFusion codebase.