Question

我想有条件地失败一个配置单元脚本。就像某个表中没有数据一样，脚本应该失败，否则继续。我知道这可能不是理想的解决方案，但出于某种原因这是我的要求。由于HQL不是程序语言，因此是一项挑战。

Answer 1

<强> ASSERT_TRUE

hive> select assert_true (2>1);
OK
NULL
Time taken: 2.61 seconds, Fetched: 1 row(s)

hive> select assert_true (2<1);
OK
Failed with exception java.io.IOException:org.apache.hadoop.hive.ql.metadata.HiveException: ASSERT_TRUE(): assertion failed.
Time taken: 1.063 seconds
hive>

<强>演示

myscript.sql

set hive.cli.errors.ignore=false; -- this is the default

select 'checkpoint 1';

drop table t1;
create table t1 as select 1;
select assert_true(count(*)>0) from t1;

select 'checkpoint 2';

drop table t2;
create table t2 as select 2 where false;
select assert_true(count(*)>0) from t2;

select 'checkpoint 3';

drop table t3;
create table t3 as select 3;
select assert_true(count(*)>0) from t3;

select 'checkpoint 4';

bash-4.1$ hive -f myscript.sql 2>/dev/null
checkpoint 1
NULL
checkpoint 2
bash-4.1$

您是否可以有条件地使Hive脚本失败？

1 个答案: