如何正確使用配置單元變量替換

Question

在蜂巢中使用變量替換時，遇到一些錯誤，但需要您的幫助。

我的代碼：

set hievar:b='on t1.id=t2.id where t2.id is null';
select * from t_old as t1 full outer join t_new as t2 ${b};

當我在hive shell中運行此代碼時，它給了我一些關於${b}錯誤。

我也嘗試這樣：

set hivevar:c='select * from t_old as t1 full outer join t_new as t2 on t1.id=t2.id where t2.id is null';
${c};

它給了我同樣的錯誤。

Answer 1

修復hivevar命名空間名稱（在您的代碼中為hievar ）並刪除引號，因為引號也會在Hive中傳遞。

例：

set hivevar:b=where 1=1; --without quotes
select 1 ${hivevar:b}; --you can do without hivevar: as in your example

結果：

OK
1
Time taken: 0.129 seconds, Fetched: 1 row(s)

第二個例子：

hive> set hivevar:c=select 1 where 1=1;
hive> ${c};
OK
1
Time taken: 0.491 seconds, Fetched: 1 row(s)