presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/InlineProjections.java/InlineProjections/apply
class InlineProjections:    @Override
    public Result apply(ProjectNode parent, Captures captures, Context context)
    {
        ProjectNode child = captures.get(CHILD);

        return inlineProjections(parent, child)
                .map(Result::ofPlanNode)
                .orElse(Result.empty());
    }