Struct ExtendableExprSchema 

struct ExtendableExprSchema<'a> {
    fields_chain: Vec<Fields>,
    outer_schema: &'a dyn ExprSchema,
}

A &dyn ExprSchema wrapper that supports adding the parameters of a lambda

Fields

fields_chain: Vec<Fields>

outer_schema: &'a dyn ExprSchema

Implementations

impl<'a> ExtendableExprSchema<'a>

fn new(schema: &'a dyn ExprSchema) -> Self

Trait Implementations

impl<'a> Clone for ExtendableExprSchema<'a>

fn clone(&self) -> ExtendableExprSchema<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for ExtendableExprSchema<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl ExprSchema for ExtendableExprSchema<'_>

fn field_from_column(&self, col: &Column) -> Result<&Field>

fn nullable(&self, col: &Column) -> Result<bool, DataFusionError>

Is this column reference nullable?

fn data_type(&self, col: &Column) -> Result<&DataType, DataFusionError>

What is the datatype of this column?

fn metadata( &self, col: &Column, ) -> Result<&HashMap<String, String>, DataFusionError>

Returns the column’s optional metadata.

fn data_type_and_nullable( &self, col: &Column, ) -> Result<(&DataType, bool), DataFusionError>

Return the column’s datatype and nullability

impl ExtendSchema for ExtendableExprSchema<'_>

fn from_fields(params: Fields) -> Result<Self>

fn extend(&self, params: Fields) -> Result<Self>