[jira] [Assigned] (IMPALA-10135) Insert events doesn't contain the inserted data files

["Vihang Karajgaonkar (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-10135?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vihang Karajgaonkar reassigned IMPALA-10135:
--------------------------------------------

    Assignee: Vihang Karajgaonkar

> Insert events doesn't contain the inserted data files
> -----------------------------------------------------
>
>                 Key: IMPALA-10135
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10135
>             Project: IMPALA
>          Issue Type: Bug
>            Reporter: Zoltán Borók-Nagy
>            Assignee: Vihang Karajgaonkar
>            Priority: Major
>
> When Impala generates INSERT EVENTs it doesn't add the newly inserted datafiles.
> The problem is that Impala misuses Sets.difference(set1, set2). From the API doc at [https://guava.dev/releases/28.2-jre/api/docs/com/google/common/collect/Sets.html#difference-java.util.Set-java.util.Set-]
> "The returned set contains all elements that are contained by {{set1}} and not contained by {{set2}}. {{set2}} may also contain elements not present in {{set1}}; these are simply ignored."
> So the name "difference" is a bit misleading, it's rather a subtraction between set1 and set2.
> Unfortunately Impala passes the parameters in wrong order: Sets.difference(beforeInsert, afterInsert):
> [https://github.com/apache/impala/blob/4cb3c3556e77ee24003383155ca5e1b70be4db6e/fe/src/main/java/org/apache/impala/service/CatalogOpExecutor.java#L4581]
> So the result will be always empty.
> There's another problem with INSERT OVERWRITEs, as it doesn't send any INSERT events.



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