Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/21403
@cloud-fan, no, it introduces a behavior change when structs are involved.
The two queries
[here](https://github.com/apache/spark/pull/21403/files/eb1dfb7e0873b8479ea54d223b7fde3dcefa4834#diff-b324aa60ed6de5866aebafc3c9b80391R10)
would fail before this query, while the version written like this would work
(and after the PR doesn't work instead):
```
select count(*) from struct_tab where record in (select a2, b2 from tab_b);
select count(*) from struct_tab where record not in (select a2, b2 from
tab_b);
```
Since before the PR any struct before the IN operator behaves like having
`(f1, f2, ...)`, while after the PR a struct there is considered as a field.
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