首先,我运行了这段代码并完成了。现在,我想从时间戳中提取仅包含数据和时间的日期。但是,我不知道该怎么做。我用GetYear
,GetMonth
,GetDay
但总是弹出一个错误。从猪的时间戳中提取日期
define Quantile datafu.pig.stats.Quantile('21'); data_raw = LOAD 'California/2016/March-2016.csv' USING PigStorage(',') AS (tmc_code:chararray, measurement_tstamp:chararray, speed:int, average_speed:int, reference_speed:int, travel_time_minutes:int,confidence_score:int, cvalue:int);
filtered_data = FILTER data_raw BY confidence_score == 30;
data_reqd = GROUP filtered_data BY (tmc_code, measurement_tstamp);
quantiles = FOREACH data_reqd GENERATE group.tmc_code, ToDate(group.measurement_tstamp,'YYYY-MM-DD HH:mm:ss') AS date, Quantile(filtered_data.speed);
results = Limit quantiles 10;
DUMP results;
我将不胜感激,如果有人可以帮助我从measurement_tstamp
只提取日期。
有什么错误? –