[FLINK-2689] Reusing null object for joins with SolutionSet

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9, 0.10.0
• Fix Version/s: 0.9, 0.10.0
• Component/s: Runtime / Task
• Assignee: Fabian Hueske
• Reporter: Fabian Hueske
• Created: 16/Sep/15 15:05
• Updated: 17/Sep/15 18:05
• Resolved: 17/Sep/15 13:44

Description

Joins and CoGroups with a solution set have outer join semantics because a certain key might not have been inserted into the solution set yet. When probing a non-existing key, the CompactingHashTable will return null.

In object reuse mode, this null value is used as reuse object when the next key is probed.