GH-399: Check for null writers in DenseUnionWriter#setPosition - #938
Merged
lidavidm merged 3 commits intoDec 29, 2025
Merged
Conversation
Copy link
Copy Markdown
Contributor
Sorry, something went wrong.
Added null checks for setPosition and test cases to validate the issue
Kaustav-Sarkar
requested review from
jbonofre,
laurentgo,
lidavidm and
wgtmac
as code owners
December 24, 2025 16:27
This comment has been minimized.
Copy link
Copy Markdown
Contributor
Author
|
I do not have permissions to set labels ❯ gh pr edit 938 --add-label "bug-fix" GraphQL: Kaustav-Sarkar does not have the correct permissions to execute `AddLabelsToLabelable` (addLabelsToLabelable) |
Sorry, something went wrong.
lidavidm
reviewed
Dec 25, 2025
Comment thread
vector/src/test/java/org/apache/arrow/vector/complex/impl/TestDenseUnionWriterNPE.java
Outdated
Comment thread
vector/src/test/java/org/apache/arrow/vector/complex/impl/TestDenseUnionWriterNPE.java
Outdated
Comment thread
vector/src/test/java/org/apache/arrow/vector/complex/impl/TestDenseUnionWriterNPE.java
Outdated
lidavidm
approved these changes
Dec 29, 2025
lidavidm
left a comment
Copy link
Copy Markdown
Member
There was a problem hiding this comment.
Thank you!
Sorry, something went wrong.
Copy link
Copy Markdown
Member
|
Ok. The JNI test is an upstream build issue, but @Kaustav-Sarkar can you fix the format error in .gitignore? https://github.com/apache/arrow-java/actions/runs/20526378098/job/59055944634?pr=938 |
Sorry, something went wrong.
ennuite
pushed a commit
to ennuite/arrow-java
that referenced
this pull request
Jan 8, 2026
…pache#938) ## apacheGH-399 Fix setPosition fails with NullPointerException Fixed a `NullPointerException` in `DenseUnionWriter#setPosition`. The issue was that `setPosition` tried to update all writers in its internal array, even if they hadn't been initialized yet. I added a null check so it only updates writers that actually exist. Also added a regression test (`TestDenseUnionWriterNPE`) to verify the fix and updated `.gitignore`. Closes apache#399.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
GH-399 Fix setPosition fails with NullPointerException
Fixed a NullPointerException in DenseUnionWriter#setPosition.
The issue was that setPosition tried to update all writers in its internal array, even if they hadn't been initialized yet. I added a null check so it only updates writers that actually exist.
Also added a regression test (TestDenseUnionWriterNPE) to verify the fix and updated .gitignore.
Closes #399.