GH-399: Check for null writers in DenseUnionWriter#setPosition #938
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Added null checks for setPosition and test cases to validate the issue
Kaustav-Sarkar
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laurentgo,
lidavidm and
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lidavidm
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Dec 25, 2025
vector/src/test/java/org/apache/arrow/vector/complex/impl/TestDenseUnionWriterNPE.java
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vector/src/test/java/org/apache/arrow/vector/complex/impl/TestDenseUnionWriterNPE.java
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lidavidm
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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 |
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GH-399 Fix setPosition fails with NullPointerException
Fixed a
NullPointerExceptioninDenseUnionWriter#setPosition.The issue was that
setPositiontried 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.