GH-812: Fix appending to an empty UnionVector - #1292
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September 10, 2026 08:09
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What's Changed
Appending to a newly created
UnionVectorrepeatedly reallocates its type buffer until allocation fails: its value capacity remains zero until it has child vectors. Check the type buffer capacity at this stage, since the existing append loop creates and expands the child vectors afterward.The regression appends two floats to an empty union with a bounded allocator. It fails before the change with an allocation error and passes afterward. All 32
TestVectorAppendertests pass with both the Netty and Unsafe allocators on JDK 21. Checkstyle and Spotless also pass.Closes #812.
Validation (JDK 21):
mvn -B -pl vector -am test -Dtest=TestVectorAppender -Dsurefire.failIfNoSpecifiedTests=false mvn -B -pl vector spotless:checkDeveloped with AI assistance; the regression was verified to fail before the fix and pass afterward.