wangyum opened a new pull request, #42180:
URL: https://github.com/apache/spark/pull/42180
### What changes were proposed in this pull request?
This PR adds `OptimizeOneRowRelationSubquery` in batch of `Subquery`.
### Why are the changes needed?
To further optimize the query. Currently, `OptimizeOneRowRelationSubquery`
cannot optimize the subquery if an optimizable filter exists. For example:
```sql
CREATE temporary VIEW v1
AS
SELECT id, 'foo' AS kind FROM (SELECT 1 AS id) t;
CREATE temporary VIEW v2
AS
SELECT * FROM v1 WHERE kind = (SELECT kind FROM v1 WHERE kind = 'foo');
EXPLAIN EXTENDED SELECT * FROM v1 JOIN v2 ON v1.id = v2.id;
```
Before this PR:
```
== Optimized Logical Plan ==
Join Inner
:- Project [1 AS id#18, foo AS kind#19]
: +- OneRowRelation
+- Project [1 AS id#21, foo AS kind#22]
+- Filter (foo = scalar-subquery#20 [])
: +- Project [foo AS kind#30]
: +- OneRowRelation
+- OneRowRelation
```
After this PR:
```
== Optimized Logical Plan ==
Join Inner
:- Project [1 AS id#253, foo AS kind#254]
: +- OneRowRelation
+- Project [1 AS id#256, foo AS kind#257]
+- OneRowRelation
```
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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