[DRILL-7912] Add Sheet Names to Excel Reader

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.18.0
• Fix Version/s: 1.19.0
• Component/s: Storage - Other
• Assignee: Charles Givre
• Reporter: Charles Givre
• Reviewer: Cong Luo
• Created: 02/May/21 04:06
• Updated: 04/May/21 04:49
• Resolved: 04/May/21 04:49

Description

Currently, there is no way to determine what sheets are available in an Excel file. This PR adds a metadata field called `_sheets` which a user can query to determine available sheets in a given file.