在加载猪的数据时出现错误

Question

我想写一个猪拉丁脚本：在这里我必须加载1951年之后的所有数据（不包括1951年），并过滤质量= 1的数据（按温度分组），然后计算每个年份的最大年份温度。

做到了

records = load '/user/a106524609/test.txt' using PigStorage(' ') as 
(year:chararray, temperature:int, quality:int);
rec1 = filter records by year >1951 and (quality == 1);

我收到此错误

Answer 1

您正在将year加载到一个chararray字段中，并将其与1951年的int进行比较。您有两个选择。将year加载到int中，否则在过滤器语句中将year转换为int。

records = load '/user/a106524609/test.txt' using PigStorage(' ') as 
(year:int, temperature:int, quality:int);
rec1 = filter records by year > 1951 and (quality == 1);

或

records = load '/user/a106524609/test.txt' using PigStorage(' ') as 
(year:chararray, temperature:int, quality:int);
rec1 = filter records by year:int > 1951 and (quality == 1);-- Note (int)year > 1951 should work too