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https://issues.apache.org/jira/browse/DRILL-7723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17109265#comment-17109265
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ASF GitHub Bot commented on DRILL-7723:
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cgivre commented on pull request #2069:
URL: https://github.com/apache/drill/pull/2069#issuecomment-629728318
@vvysotskyi
That is correct. This follows the model for EVF readers where data is
written to the writers and the EVF framework determines which columns to
actually project.
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> Add Excel Metadata as Implicit Fields
> -------------------------------------
>
> Key: DRILL-7723
> URL: https://issues.apache.org/jira/browse/DRILL-7723
> Project: Apache Drill
> Issue Type: Improvement
> Components: Metadata, Storage - Text & CSV
> Affects Versions: 1.17.0
> Reporter: Charles Givre
> Assignee: Charles Givre
> Priority: Major
> Fix For: 1.18.0
>
>
> Excel files contain a significant number of metadata fields in them. This PR
> adds the ability to access these fields via implicit columns. The columns are:
> _category
> _content_status
> _content_type;
> _creator
> _description
> _identifier
> _keywords
> _last_modified_by_user
> _revision
> _subject
> _title
> _created
> _last_printed
> _modified
> These fields are not projected in star queries so there is no effect on
> existing queries.
>
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