Function find_aggregate_exprs

datafusion/expr/src/utils.rs:649–653

Collect all deeply nested `Expr::AggregateFunction`. They are returned in order of occurrence (depth first), with duplicates omitted.

(exprs: impl IntoIterator<Item = &'a Expr>)

/// They are returned in order of occurrence (depth
/// first), with duplicates omitted.
pub fn find_aggregate_exprs<'a>(exprs: impl IntoIterator<Item = &'a Expr>) -> Vec<Expr> {
    find_exprs_in_exprs(exprs, &|nested_expr| {
        matches!(nested_expr, Expr::AggregateFunction { .. })
    })
}

/// Collect all deeply nested `Expr::WindowFunction`. They are returned in order of occurrence
/// (depth first), with duplicates omitted.