int_col	str_col	float_col	datetime_col
123	"""a""b"	1.54778	2002-12-01 23:59:00
300.23	string 	 300.99 	23:59:00
	20.75 	-500.1789	2012-12-11
-5000		70000.1	null	
45000	 "true"	258.7	1999-08-01		
152	 "111"	1.54778	2000-12-05 23:59:00:441
