Function unnormalize_cols

datafusion/expr/src/expr_rewriter/mod.rs:199–201

(exprs: impl IntoIterator<Item = Expr>)

/// Recursively un-normalize all [`Column`] expressions in a list of expression trees
#[inline]
pub fn unnormalize_cols(exprs: impl IntoIterator<Item = Expr>) -> Vec<Expr> {
    exprs.into_iter().map(unnormalize_col).collect()
}

/// Recursively remove all the ['OuterReferenceColumn'] and return the inside Column
/// in the expression tree.