Module order_by 

Rewrite for order by expressions

Functions

expr_match 🔒

Does the underlying expr match e? so avg(c) as average will match avgc

rewrite_in_terms_of_projection 🔒

Rewrites a sort expression in terms of the output of the previous LogicalPlan

rewrite_sort_col_by_aggs 🔒

rewrite_sort_cols_by_aggs

Rewrite sort on aggregate expressions to sort on the column of aggregate output For example, max(x) is written to col("max(x)")