[FLINK-7425] Support Map<K,V> in TypeExtractor

• Type: Improvement
• Status: Open
• Priority: Not a Priority
• Resolution: Unresolved
• Component/s: API / Type Serialization System
• Labels: auto-deprioritized-major auto-deprioritized-minor
• Assignee: Unassigned
• Reporter: Timo Walther
• Created: 11/Aug/17 04:36
• Updated: 13/Dec/21 22:37

Description

If you print new TypeHint<Map<String, String>>(){}.getType() you will see that even this is GenericTypeInfo. This is confusing, but maps where not supported initially. It would be good to officially support all major Java collections. I don't know if we can change this behavior because of backwards compatibility.

See discussion here: https://stackoverflow.com/questions/45621542/flink-sql-api-with-map-types-java/45622438#45622438