Function push_projection_dedupl

datafusion/sql/src/utils.rs:627–635

(projection: &mut Vec<Expr>, expr: Expr)

}

fn push_projection_dedupl(projection: &mut Vec<Expr>, expr: Expr) {
    let schema_name = expr.schema_name().to_string();
    if !projection
        .iter()
        .any(|e| e.schema_name().to_string() == schema_name)
    {
        projection.push(expr);
    }
}
/// The context is we want to rewrite unnest() into InnerProjection->Unnest->OuterProjection
/// Given an expression which contains unnest expr as one of its children,
/// Try transform depends on unnest type