presto-main/src/main/java/io/prestosql/sql/relational/SqlToRowExpressionTranslator.java/Visitor/visitTimestampLiteral
class Visitor:        @Override
        protected RowExpression visitTimestampLiteral(TimestampLiteral node, Void context)
        {
            long value;
            if (isLegacyTimestamp) {
                value = parseTimestampLiteral(timeZoneKey, node.getValue());
            }
            else {
                value = parseTimestampLiteral(node.getValue());
            }
            return constant(value, getType(node));
        }