Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22029
Do you know how other databases behave for `(a, b) in (struct_col1,
struct_col2, ...)` and `input_struct_col in (struct_col1, struct_col2, ...)`?
Since `(a, b)` may be treated specially, we need to look at the behaviors
carefully.
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