presto-main/src/main/java/io/prestosql/sql/planner/ReferenceAwareExpressionNodeInliner.java/ReferenceAwareExpressionNodeInliner/rewriteExpression
class ReferenceAwareExpressionNodeInliner:    @Override
    public Expression rewriteExpression(Expression node, Void context, ExpressionTreeRewriter<Void> treeRewriter)
    {
        return mappings.get(NodeRef.of(node));
    }