pan3793 opened a new pull request #1974:
URL: https://github.com/apache/incubator-kyuubi/pull/1974
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### _Why are the changes needed?_
This PR aims to support auto merge small files in multi insert statement,
for example
`FROM (SELECT * FROM VALUES(1) DOSTRIBUTE BY col1 ) INSERT INTO tmp1 SELECT
* INSERT INTO tmp2 SELECT *;`
will generate the following plan, `Union` is the root node instead of
`InsertIntoHiveTable`
```
Union
:- InsertIntoHiveTable
: +- Project
: +- SubqueryAlias __auto_generated_subquery_name
: +- RepartitionByExpression
: +- Project
: +- LocalRelation
+- InsertIntoHiveTable
+- Project
+- SubqueryAlias __auto_generated_subquery_name
+- RepartitionByExpression
+- Project
+- LocalRelation
```
This PR also fix the `canInsertRepartitionByExpression`, previous did not
consider the `SubqueryAlias` which may cause inserting error
`Repartition`/`Reblance` node to currupt the data distribution.
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including
negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run
test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests)
locally before make a pull request
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