Github user xuanyuanking commented on the issue:
https://github.com/apache/spark/pull/22326
@cloud-fan Thanks for your comment.
```
IIUC, you are pulling out the join condition with python UDF and create a
filter above join. Then the join become a cross join, which usually runs very
slowly.
```
Yes, that's right.
```
I think we should keep the cross join check for this case.
```
Yes, as Marco suggestion, the currently behavior is control cross join by
`crossJoinEnabled` config, if crossJoinEnabled = false, it will throw
AnalysisException.
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