allisonwang-db opened a new pull request, #38968:
URL: https://github.com/apache/spark/pull/38968
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### What changes were proposed in this pull request?
This PR supports `Generate` with no required child output to host outer
references. It updates DecorrelateInnerQuery to handle Generate and adds a new
optimization for Generate and OneRowRelation in rule
OptimizeOneRowRelationSubquery.
### Why are the changes needed?
Currently, CheckAnalysis allows `Generate` with no required child output to
host outer references. However, DecorrelateInnerQuery does not handle this
case correctly. For example
```
select * from t, lateral (select explode(array(c1, c2)))
```
This will throw an internal error:
```
AssertionError: assertion failed: Correlated column is not allowed in
Generate
```
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Unit tests and SQL query tests.
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