我希望能够使用正则表达式提取查询的源表。这将帮助我构建一个脚本来测试依赖项，而不必访问集群。
例子：

use datalab2;
select 
   *
from hello as table1
left join (
  select 
     *
  from ${hiveconf:varable_db}.events
  where  test=1
) as table2 on 
  table2.test = table1.test
inner join datalab3.table3 as table3 on 
  table3.test = table1.test;

将返回：

<br>
hello <br>
${hiveconf:varable_db}.events <br>
datalab3.table3 <br>