[jira] [Updated] (ARROW-16692) [C++] StackOverflow in merge generator causes segmentation fault in scan

["Weston Pace (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-16692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Weston Pace updated ARROW-16692:
--------------------------------
    Summary: [C++] StackOverflow in merge generator causes segmentation fault in scan  (was: [C++] Segfault in datasets)

> [C++] StackOverflow in merge generator causes segmentation fault in scan
> ------------------------------------------------------------------------
>
>                 Key: ARROW-16692
>                 URL: https://issues.apache.org/jira/browse/ARROW-16692
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Jonathan Keane
>            Assignee: Weston Pace
>            Priority: Blocker
>             Fix For: 9.0.0
>
>         Attachments: backtrace.txt
>
>
> I'm still working to make a minimal reproducer for this, though I can reliably reproduce it below (though that means needing to download a bunch of data first...). I've cleaned out much of the unnecessary code (so this query below is a bit silly, and not what I'm actually trying to do), but haven't been able to make a constructed dataset that reproduces this.
> Working on some example with the new | more cleaned taxi dataset at {{s3://ursa-labs-taxi-data-v2}}, I've run into a segfault:
> {code}
> library(arrow)
> library(dplyr)
> ds <- open_dataset("path/to/new_taxi/")
> ds %>%
>   filter(!is.na(pickup_location_id)) %>%
>   summarise(n = n()) %>% collect()
> {code}
> Most of the time ends in a segfault (though I have gotten it to work on occasion). I've tried with smaller files | constructed datasets and haven't been able to replicate it yet. One thing that might be important is:  {{pickup_location_id}} is all NAs | nulls in the first 8 years of the data or so.
> I've attached a backtrace in case that's enough to see what's going on here.



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