presto-main/src/main/java/io/prestosql/spi/expression/PartialTranslator.java/PartialTranslator/Visitor
class PartialTranslator:        Visitor(Map<NodeRef<Expression>, Type> types, Map<NodeRef<Expression>, ConnectorExpression> translatedSubExpressions)
        {
            requireNonNull(types, "types is null");
            this.translatedSubExpressions = requireNonNull(translatedSubExpressions, "translatedSubExpressions is null");
            this.translator = new ConnectorExpressionTranslator.SqlToConnectorExpressionTranslator(types);
        }