David Li created ARROW-14630:
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Summary: [C++] DCHECK in GroupByNode when error encountered
Key: ARROW-14630
URL: https://issues.apache.org/jira/browse/ARROW-14630
Project: Apache Arrow
Issue Type: Bug
Components: C++
Affects Versions: 6.0.0
Reporter: Nicola Crane
Assignee: David Li
[~thisisnic] found that this example crashes:
{code:java}
library(arrow)
library(dplyr)write_dataset(group_by(iris, Species),
"iris_data")open_dataset("iris_data") %>%
group_by(Species) %>%
summarise(mean(Sepal.Length)) %>%
collect() {code}
There are two bugs here:
* StopProducing is written in a way that causes a future to be finished twice,
triggering a DCHECK.
* Consume() doesn't set the length of the key column batch, causing a spurious
error because the group ID datum and the values datum will have different
lengths.
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