Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22029
It looks to me that this is another instance of special handling `(a, b,
..)`, like https://github.com/apache/spark/pull/21403
`(a, b) in (struct_col1, struct_col2, ...)` is different from
`input_struct_col in (struct_col1, struct_col2, ...)`, right?
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