Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/22029
@cloud-fan yes, but the behavior of EQUAL is not so consistent among the
different DBs. In Hive EQUAL on struct behaves like Spark as of now, in Presto
throws exception if there is a null, Postgres is different and it is as you
mentioned. So I am not sure we have strong reasons to update how EQUAL works
for struct. That doesn't seem to be handled consistently in other DBs. That's
why I proposed this change, in order to handle IN consistently without
modifying EQUAL for structs.
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