[DRILL-7723] Add Excel Metadata as Implicit Fields

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.17.0
• Fix Version/s: 1.18.0
• Component/s: Metadata, Storage - Text & CSV
• Assignee: Charles Givre
• Reporter: Charles Givre
• Created: 30/Apr/20 02:32
• Updated: 25/Jun/20 00:26
• Resolved: 25/Jun/20 00:26

Description

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.