JOIN用法在PigLatin

Question

我要加入兩個表/別名，讓說：

Table A (People_ID, People_Name) 
Table B (Location, People_ID) 

以下是我的豬拉丁文輸入：

join_table = JOIN A BY People_ID, B BY People_ID 

然而，當我進入：

describe join_table; 

它顯示：

join_table:{A::people_id:int,A::people_name:chararray,B::people_id:int,B::location:chararray} 

這是正常的嗎？我想結果應該是這樣的：

join_table:{A::people_id:int,A::people_name:chararray,B::location:chararray} 

Answer 1

是輸出是正常的，你想要的輸出，你必須產生另一個關係的JOINED關係。

試試這個：

join_table = JOIN A BY People_ID, B BY People_ID 

generate_joined_table = FOREACH join_table GENERATE 
A::people_id AS people_id,A::people_name AS people_name,B::location AS location; 

DESCRIBE generate_joined_table;