ARROW-11788: [Java] Fix appending empty delta vectors#9581
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liyafan82
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Feb 26, 2021
| try (IntVector target = new IntVector("", allocator); | ||
| IntVector delta = new IntVector("", allocator)) { | ||
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| target.allocateNew(10); |
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This is not needed, as ValueVectorDataPopulator.setVector will do the allocation.
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I removed all explicit calls for allocation if the utility method performs the allocation.
liyafan82
reviewed
Feb 26, 2021
| assertEquals(10, target.getValueCount()); | ||
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| try (IntVector expected = new IntVector("expected", allocator)) { | ||
| expected.allocateNew(); |
liyafan82
reviewed
Feb 26, 2021
| try (VarCharVector target = new VarCharVector("", allocator); | ||
| VarCharVector delta = new VarCharVector("", allocator)) { | ||
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| target.allocateNew(5, 10); |
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This is not needed either, as ValueVectorDataPopulator.setVector calls the getSafe method.
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@nbruno Thanks for the PR. Merging. |
pribor
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Oct 24, 2025
This PR fixes a bug where appending an empty list vector fails with a `NullPointerException`. Instead of attempting to process the delta vector, we just return early with the unmodified target vector, since there is nothing to append to the target vector from the delta vector. In addition, it fixes cases where appending an empty delta vector would've caused the same NPE, or where it'd be an optimization to not attempt processing an empty delta vector. Unit tests are added for all supported `VectorAppender` vector types. Closes apache#9581 from nbruno/ARROW-11788 Authored-by: Nick Bruno <nbruno@users.noreply.github.com> Signed-off-by: liyafan82 <fan_li_ya@foxmail.com>
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This PR fixes a bug where appending an empty list vector fails with a
NullPointerException. Instead of attempting to process the delta vector, we just return early with the unmodified target vector, since there is nothing to append to the target vector from the delta vector. In addition, it fixes cases where appending an empty delta vector would've caused the same NPE, or where it'd be an optimization to not attempt processing an empty delta vector. Unit tests are added for all supportedVectorAppendervector types.