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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/02/04 06:36:32 UTC

[GitHub] [flink] wuchong opened a new pull request #11011: [FLINK-15658][table-planner-blink] Fix duplicate field names exception when join on the same key multiple times

wuchong opened a new pull request #11011: [FLINK-15658][table-planner-blink] Fix duplicate field names exception when join on the same key multiple times
URL: https://github.com/apache/flink/pull/11011

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## What is the purpose of the change

The exmaple raised in the JIRA that batch can run successfully, but streaming will fail. The root cause is that the join key may be duplicate and the constructed key RowType will have duplicate field names.

## Brief change log

We do not provide field names for the result key type, because we may have duplicate key fields and the field names may conflict.

## Verifying this change

Added an IT case to verify this, the IT case will fail without this fix.

## Does this pull request potentially affect one of the following parts:

- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
- Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
- The S3 file system connector: (yes / **no** / don't know)

## Documentation

- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)

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