presto-main/src/main/java/io/prestosql/sql/planner/optimizations/PruneUnreferencedOutputs.java/Rewriter/visitExplainAnalyze
class Rewriter:        @Override
        public PlanNode visitExplainAnalyze(ExplainAnalyzeNode node, RewriteContext<Set<Symbol>> context)
        {
            return context.defaultRewrite(node, ImmutableSet.copyOf(node.getSource().getOutputSymbols()));
        }