[FLINK-3139] NULL values handling in Table API

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.1.0
• Component/s: Table SQL / API
• Assignee: Unassigned
• Reporter: Chengxiang Li
• Created: 08/Dec/15 06:04
• Updated: 27/Apr/21 18:04
• Resolved: 18/May/16 13:44

Description

This is an umbrella task for NULL value handling in Table API.
As the logical API for queries, Table API should support handling NULL values, NULL value is quite a common case during logical query, for example:

1. Data source may miss column value in many cases("value missing", "value unknown", "value not applicable" .etc ).
2. Some operators generate Null values on their own, like Outer Join/Cube/Rollup/Grouping Set, and so on. Null values handling in Table API is the prerequisite of these features.

Issue Links

• is required by: FLINK-2099 Add a SQL API