Trait OutputElement

Source

pub trait OutputElement:
    'static
    + Sized
    + Default {
    // Required methods
    fn element_dtype() -> DType;
    fn build(values: Vec<Self>) -> ArrayRef;
}

Expand description

An owned row value that can be built into an all-valid column.

Skip-invalid execution uses Default only as a placeholder for invalid rows. Batch execution masks those rows before returning the output.

Required Methods§

Source

fn element_dtype() -> DType

The dtype of columns built from this element type. Must be non-nullable: nullability is derived from the inputs by batch execution.

Because this method takes no arguments, the dtype must be a property of the Rust type. Use an OutputSink when the output dtype depends on function options.

Source

fn build(values: Vec<Self>) -> ArrayRef

Build an all-valid column from one value per row.

The returned column must contain values.len() rows and match element_dtype except for outer nullability. The framework calls this method once per batch.