James Turton created DRILL-8261:
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Summary: 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
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
an empty struct. It is therefore proposed that the attributes MAP becomes an
implicit column.
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