parthchandra commented on issue #1843:
URL:
https://github.com/apache/datafusion-comet/issues/1843#issuecomment-2947362362
Why would the expected result be `[null], [null], [null]` ? This means that
all the structs are null but that is not the actual data. Only in the third
row, is the struct actually null.
The data is equivalent to -
```
Row 1
_1 :
_1 : 1
_2 : "a"
_3 is missing (so is in fact null)
_4 is missing (therefore also null)
Row 2
_1 :
_1 : 2
_2: null
_3 is missing
_4 is missing
Row 3
null
```
So for Row 1 one would expect the value of the `struct _1` to be not null
for row's 1 and 2. The fields _1._3 and _1._4 are not in the data (and the type
for _1._4 does not match) so the values of those fields are in fact null. Looks
like DF is correct.
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