Struct datafusion_expr::logical_plan::Projection

pub struct Projection {
    pub expr: Vec<Expr>,
    pub input: Arc<LogicalPlan>,
    pub schema: DFSchemaRef,
    pub alias: Option<String>,
}

Evaluates an arbitrary list of expressions (essentially a SELECT with an expression list) on its input.

Fields

expr: Vec<Expr>

The list of expressions

input: Arc<LogicalPlan>

The incoming logical plan

schema: DFSchemaRef

The schema description of the output

alias: Option<String>

Projection output relation alias

Implementations

impl Projection

pub fn try_new(
    expr: Vec<Expr>,
    input: Arc<LogicalPlan>,
    alias: Option<String>
) -> Result<Self, DataFusionError>

Create a new Projection

pub fn try_new_with_schema(
    expr: Vec<Expr>,
    input: Arc<LogicalPlan>,
    schema: DFSchemaRef,
    alias: Option<String>
) -> Result<Self, DataFusionError>

Create a new Projection using the specified output schema

pub fn try_from_plan(plan: &LogicalPlan) -> Result<&Projection>

Trait Implementations

impl Clone for Projection

fn clone(&self) -> Projection

Returns a copy of the value.

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

Performs copy-assignment from source.