[SPARK-47821] Add is_variant_null expression

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0
• Fix Version/s: 4.0.0
• Component/s: SQL
• Labels: pull-request-available
• Assignee: Richard Chen
• Reporter: Richard Chen
• Created: 11/Apr/24 18:08
• Updated: 17/Apr/24 07:54
• Resolved: 17/Apr/24 07:54

Description

adds a `is_variant_null` expression, which returns whether a given variant value represents a variant null (note the difference between a variant null and an engine null)

Issue Links

• links to: [SPARK-47821][SQL] Implement is_variant_null expression
• links to: GitHub Pull Request #46011