remove todo

Author: James Cor

sql/analyzer/replace_sort.go

@@ -153,7 +153,6 @@ func replaceIdxSortHelper(ctx *sql.Context, scope *plan.Scope, node sql.Node, so
 		var err error
 		same := transform.SameTree
 		switch c := child.(type) {
-		// TODO: include distinct here?
 		case *plan.Project, *plan.TableAlias, *plan.ResolvedTable, *plan.Filter, *plan.Limit, *plan.Offset, *plan.Sort, *plan.IndexedTableAccess, *plan.Distinct:
 			newChildren[i], same, err = replaceIdxSortHelper(ctx, scope, child, sortNode)
 		default: