Struct datafusion_python::optimizer::utils::NamePreserver

pub struct NamePreserver { /* private fields */ }

Handles ensuring the name of rewritten expressions is not changed.

For example, if an expression 1 + 2 is rewritten to 3, the name of the expression should be preserved: 3 as "1 + 2"

See https://github.com/apache/datafusion/issues/3555 for details

Implementations

impl NamePreserver

pub fn new(plan: &LogicalPlan) -> NamePreserver

Create a new NamePreserver for rewriting the expr that is part of the specified plan

pub fn new_for_projection() -> NamePreserver

Create a new NamePreserver for rewriting the exprs in Projection

This will use aliases

pub fn save(&self, expr: &Expr) -> Result<SavedName, DataFusionError>