hadoop - pig 帮 : How can I add a fixed field that is not defined in the schema

Question

如何添加架构中未定义的固定字段(例如日期或月份)？我运行了以下 pig 脚本以将固定日期添加到我的结果表中，并收到以下错误消息:Invalid field projection。方案中不存在投影字段 [日期]。

joined_table = join A by (key1), 
                 B by (key1);

result  =  foreach joined_table generate 
                    20140625 as date,
                    A::value1 as v1,
                    B::value1 as v2;

Answer 1

这是你可能想要的:

    result = FOREACH joined_table GENERATE '20140625' as date, A::some_field;