[FLINK-29648] "LocalDateTime not supported" error when retrieving Java TypeInformation from PyFlink

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.16.0
• Fix Version/s: 1.16.0
• Component/s: API / Python
• Labels: pull-request-available
• Assignee: Juntao Hu
• Reporter: Juntao Hu
• Created: 15/Oct/22 09:28
• Updated: 18/Oct/22 06:50
• Resolved: 18/Oct/22 06:50

Description

The following code raises "TypeError: The java type info: LocalDateTime is not supported in PyFlink currently.":

t_env.to_data_stream(t).key_by(...)

However, this works:

t_env.to_data_stream(t).map(lambda r: r).key_by(...)

Although we add Python coders for LocalTimeTypeInfo in 1.16, there's no corresponding typeinfo at Python side. So it works when a user immediately does processing after to_data_stream since date/time data has already been converted to Python object, but when key_by tries to retrieve typeinfo from Java TypeInformation, it fails.

Issue Links

• is related to: FLINK-29658 LocalTime support when converting Table to DataStream in PyFlink
• links to: GitHub Pull Request #21079