presto-main/src/main/java/io/prestosql/sql/planner/optimizations/UnaliasSymbolReferences.java/Rewriter/visitExplainAnalyze
class Rewriter:        @Override
        public PlanNode visitExplainAnalyze(ExplainAnalyzeNode node, RewriteContext<Void> context)
        {
            PlanNode source = context.rewrite(node.getSource());
            return new ExplainAnalyzeNode(node.getId(), source, canonicalize(node.getOutputSymbol()), node.isVerbose());
        }