使用sum()时出现pig脚本错误

y0u0uwnf 于 2021-06-21 发布在 Pig

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我在运行这个pig脚本时遇到以下错误…请帮助！！！提前谢谢。

"ERROR 1000: Error during parsing. Scalars can be only used with projections"

MOVIES = LOAD '/MOVIES' using PigStorage(',') as (mid:double, mn:chararray, yr:int, rt:float, dr:int);

Filter11 = filter MOVIES by $2 >= 1950;

Filter12 = filter Filter11 by $2 <= 1960;

Group1 = group Filter12 by yr;

Count1 = foreach Group1 generate group, COUNT(Filter12);

Sum1 = foreach Count1 generate SUM(Group1);

DUMP Sum1;

apache-pig

来源：https://stackoverflow.com/questions/42316322/pig-script-error-while-using-sum

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按热度按时间

iibxawm41#

将两个过滤条件结合起来，在最后一步中，将计数相加，即count（filter11）或$1。

MOVIES = LOAD '/MOVIES' using PigStorage(',') as (mid:double, mn:chararray, yr:int, rt:float, dr:int);
Filter11 = filter MOVIES by ($2 >= 1950 and $2 <= 1960);
Group1 = group Filter11 by yr;
Count1 = foreach Group1 generate group, COUNT(Filter11);
Sum1 = foreach Count1 generate SUM($1);
DUMP Sum1;

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使用sum()时出现pig脚本错误

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