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https://issues.apache.org/jira/browse/DRILL-7979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17391652#comment-17391652
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ASF GitHub Bot commented on DRILL-7979:
---------------------------------------
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 I proposed for empty XML
elements, but things are otherwise different. 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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> Self-Closing XML Tags Cause Schema Change Exceptions
> ----------------------------------------------------
>
> Key: DRILL-7979
> URL: https://issues.apache.org/jira/browse/DRILL-7979
> Project: Apache Drill
> Issue Type: Bug
> Components: Storage - Other
> Affects Versions: 1.19.0
> Reporter: Charles Givre
> Assignee: Charles Givre
> Priority: Major
> Fix For: 1.20.0
>
>
> Self closing XML tags are dealt with strangely by java's streaming parser.
> If you have data where you have one row containing a self closing XML tag foo
> (<foo/>) but then in the next row `foo` contains a map or other nested field,
> Drill will throw a schema change exception.
> This proposed fix causes Drill to ignore self-closing tags unless they have
> attributes, which allows data like this to be successfully queried.
>
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