wankunde opened a new pull request, #39457:
URL: https://github.com/apache/spark/pull/39457
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### What changes were proposed in this pull request?
Infer IsNotNull constraints for complex join expressions along with
IsNotNull constraints for the attribute.
For example,
```sql
CREATE TABLE t(id int, text string) using parquet;
SELECT *
FROM t as t1
LEFT JOIN t as t2
ON t1.text = get_json_object(t2.text, '$.not_exists_col');
```
Before this PR
```
Join LeftOuter, (text#282 = get_json_object(text#284, $.not_exists_col))
:- Relation default.t[id#281L,text#282] parquet
+- Relation default.t[id#283L,text#284] parquet
```
After this PR
```
Join LeftOuter, (text#282 = get_json_object(text#284, $.not_exists_col))
:- Relation default.t[id#281L,text#282] parquet
+- Filter isnotnull(get_json_object(text#284, $.not_exists_col))
+- Relation default.t[id#283L,text#284] parquet
```
### Why are the changes needed?
For the rows which the result of complex join expression is null will cause
data skew, and will be filtered out until the join.
That would be very slow.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Added UT
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