Enum SelectItem 

pub enum SelectItem<'a> {
    ColumnName(&'a str),
    Expr(Expr),
}

Re-export for API compatibility. Select item: either a column name (str) or an expression (PySpark parity: select(“a”, col(“b”).alias(“x”))). Fixes #645: select expects Column or str.

Variants

ColumnName(&'a str)

Column name; resolved per DataFrame case sensitivity.

Expr(Expr)

Expression (e.g. from col(“x”).cast(…).alias(“y”)).

Trait Implementations

impl<'a> Clone for SelectItem<'a>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.