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https://issues.apache.org/jira/browse/FLINK-22075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17325359#comment-17325359
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Flink Jira Bot commented on FLINK-22075:
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This issue is assigned but has not received an update in 7 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> Incorrect null outputs in left join
> -----------------------------------
>
> Key: FLINK-22075
> URL: https://issues.apache.org/jira/browse/FLINK-22075
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.12.2
> Environment:
> https://github.com/jamii/streaming-consistency/blob/4e5d144dacf85e512bdc7afd77d031b5974d733e/pkgs.nix#L25-L46
> ```
> [nix-shell:~/streaming-consistency/flink]$ java -version
> openjdk version "1.8.0_265"
> OpenJDK Runtime Environment (build 1.8.0_265-ga)
> OpenJDK 64-Bit Server VM (build 25.265-bga, mixed mode)
> [nix-shell:~/streaming-consistency/flink]$ flink --version
> Version: 1.12.2, Commit ID: 4dedee0
> [nix-shell:~/streaming-consistency/flink]$ nix-info
> system: "x86_64-linux", multi-user?: yes, version: nix-env (Nix) 2.3.10,
> channels(jamie): "", channels(root): "nixos-20.09.3554.f8929dce13e", nixpkgs:
> /nix/var/nix/profiles/per-user/root/channels/nixos
> ```
> Reporter: Jamie Brandon
> Assignee: lincoln lee
> Priority: Critical
> Labels: stale-assigned
>
> I'm left joining a table with itself
> [here](https://github.com/jamii/streaming-consistency/blob/4e5d144dacf85e512bdc7afd77d031b5974d733e/flink/src/main/java/Demo.java#L55-L66).
> The output should have no nulls, or at least emit nulls and then retract
> them. Instead I see:
> ```
> jamie@machine:~/streaming-consistency/flink$ wc -l tmp/outer_join_with_time
> 100000 tmp/outer_join_with_time
> jamie@machine:~/streaming-consistency/flink$ grep -c insert
> tmp/outer_join_with_time
> 100000
> jamie@machine:~/streaming-consistency/flink$ grep -c 'null'
> tmp/outer_join_with_time
> 16943
> ```
> ~1.7% of the outputs are incorrect and never retracted.
> [Full
> output](https://gist.githubusercontent.com/jamii/983fee41609b1425fe7fa59d3249b249/raw/069b9dcd4faf9f6113114381bc7028c6642ca787/gistfile1.txt)
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