[DRILL-7739] Allow implicit casts from required to nullable data type

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.17.0
• Fix Version/s: 1.18.0
• Labels: ready-to-commit
• Assignee: Vova Vysotskyi
• Reporter: Vova Vysotskyi
• Created: 17/May/20 19:39
• Updated: 27/May/20 04:13
• Resolved: 25/May/20 22:36

Description

UDFs that accept nullable vector should be able to handle data from the required vector. Drill already has UDFs for converting required to nullable holders, so just function calls should be inserved where possible.

It will be also useful for vararg UDFs, where previously was required having the same data mode for all vararg arguments.