如何在 Hive 中无限制地防止 sql？

Question

Many users are used to using 'select * from tables' in oracle/mysql很多用户习惯在oracle/mysql中使用'select * from tables'

But i should not allow them to query like that in hive但是我不应该让他们在 hive 中这样查询

Is there any way to prevent a full_table scan in hive?有什么办法可以防止在 hive 中进行 full_table 扫描？

Like trigger or somethng else?像触发器还是别的什么？

Thanks a lot!非常感谢！

Answer 1

To prevent full table scan use these settings.要防止全表扫描，请使用这些设置。

set hive.mapred.mode=strict;  --prevent full scan
SET hive.limit.query.max.table.partition=10; --limit partitions to 10

Hive will generate exception if partition predicate is not specified:如果未指定分区谓词，Hive 将产生异常：

FAILED: SemanticException [Error 10041]: No partition predicate found

And exception example in case the number of partitions exceeded:以及超出分区数的例外示例：

SemanticException Number of partitions scanned (=37) on table