Function rewrite_recursive_unnests_bottom_up

datafusion/sql/src/utils.rs:354–374

(
    input: &LogicalPlan,
    unnest_placeholder_columns: &mut IndexMap<Column, Option<Vec<ColumnUnnestList>>>,
    inner_projection_exprs: &mut Vec<Expr>,
    original_exprs: &[Expr],
)

}

pub(crate) fn rewrite_recursive_unnests_bottom_up(
    input: &LogicalPlan,
    unnest_placeholder_columns: &mut IndexMap<Column, Option<Vec<ColumnUnnestList>>>,
    inner_projection_exprs: &mut Vec<Expr>,
    original_exprs: &[Expr],
) -> Result<Vec<Expr>> {
    Ok(original_exprs
        .iter()
        .map(|expr| {
            rewrite_recursive_unnest_bottom_up(
                input,
                unnest_placeholder_columns,
                inner_projection_exprs,
                expr,
            )
        })
        .collect::<Result<Vec<_>>>()?
        .into_iter()
        .flatten()
        .collect::<Vec<_>>())
}

pub const UNNEST_PLACEHOLDER: &str = "__unnest_placeholder";