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https://issues.apache.org/jira/browse/DRILL-8261?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Turton closed DRILL-8261.
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Resolution: Not A Problem
> Make the XML format plugin's attributes MAP an implicit column
> --------------------------------------------------------------
>
> Key: DRILL-8261
> URL: https://issues.apache.org/jira/browse/DRILL-8261
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - XML
> Affects Versions: 1.20.1
> Reporter: James Turton
> Assignee: James Turton
> Priority: Minor
> Fix For: 2.0.0
>
>
> The attributes MAP column generated by the XML format plugin is currently
> explicit and present in wildcard selects. However, attributes are frequently
> not present at all in XML data, or are better queried using explicit
> projections of the individual attributes of interest to scalars. The
> motivating example here is an ETL-style query that transforms XML to Parquet
> using a CTAS with a wildcard column spec. This query will fail for XML that
> has no attributes because the Parquet writer cannot write a Parquet schema
> containing the empty struct produced by the attributes map. It is therefore
> proposed that the attributes MAP becomes an implicit column.
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