presto-main/src/main/java/io/prestosql/sql/gen/LambdaExpressionExtractor.java/LambdaExpressionExtractor/getLambdaExpressionsPostOrder
class LambdaExpressionExtractor:        private List<LambdaDefinitionExpression> getLambdaExpressionsPostOrder()
        {
            return lambdaExpressions.build();
        }