dzamo edited a comment on pull request #2283:
URL: https://github.com/apache/drill/pull/2283#issuecomment-891086769
Perhaps we should be trying for consistency with what Drill does with
analogous JSON data. Querying this document
```json
[
{
"foo": null
},
{
"foo": { "bar": 0 }
}
]
```
gives you
```
foo |
---------|
{} |
{"bar":0}|
```
. The null value becomes an empty map, as proposed for empty XML elements,
but things are different to my earlier comment. Adding an object with an int
property `{"foo": 2}` returns an error, not a map with a special key
`{'__value__' : 2 }`. Changing that second object hold `"foo": [ 1, 2, 3 ]`
makes the foo column an array. Somehow Drill is able to delay its decision on
the column type until the ocurrence of the first non-null value. Is this
something that's possible with Easy format plugins?
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