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https://issues.apache.org/jira/browse/DRILL-7979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17392193#comment-17392193
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ASF GitHub Bot commented on DRILL-7979:
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dzamo commented on pull request #2283:
URL: https://github.com/apache/drill/pull/2283#issuecomment-891687681
Now that I test master again after this merge, both the self-closing and
long form empty XML element cases work perfectly. As with the JSON example
above, an empty `<foo></foo>` followed by a parent `<foo><bar>1</bar></foo>`
results in a empty map for the `<foo></foo>`, while before the merge I got an
error. I have to confess that I couldn't see all of this getting sorted about
by this PR, which seemed focussed on self-closing tags only, but perhaps I was
testing an old build in the first place. Nice one!
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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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