comphead commented on issue #2321:
URL:
https://github.com/apache/datafusion-comet/issues/2321#issuecomment-3259489120
The issue is in nullability flag, the binary comparison in DF is done by
```
if left_data_type.is_nested() {
if !left_data_type.equals_datatype(&right_data_type) {
return internal_err!("Cannot evaluate binary expression
because of type mismatch: left {}, right {} ", left_data_type, right_data_type);
}
return apply_cmp_for_nested(self.op, &lhs, &rhs);
}
```
And `equals_datatype` checks the nulls flag
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