jchen5 opened a new pull request, #38432:
URL: https://github.com/apache/spark/pull/38432
## What changes were proposed in this pull request?
Adds support for subquery decorrelation with UNION, INTERSECT, and EXCEPT on
the correlation paths. For example:
```
SELECT t1a, (
SELECT sum(b) FROM (
SELECT t2b as b FROM t2 WHERE t2a = t1.t1a
INTERSECT
SELECT t3b as b FROM t3 WHERE t3a = t1.t1a
))
FROM t1
```
### Why are the changes needed?
To improve subquery support in Spark.
### Does this PR introduce _any_ user-facing change?
Before this change, queries like this would return an error like:
`Decorrelate inner query through Union is not supported.`
After this PR, this query can run successfully.
### How was this patch tested?
Unit tests and SQL query tests.
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