Describe the bug, including details regarding any error messages, version, and platform.
Description:
When appending a UnionVector to an empty target UnionVector, this while loop runs infinitely until the exception occurs:
org.apache.arrow.vector.util.OversizedAllocationException: Unable to expand the buffer
It seems to be a issue with the UnionVector.getValueCapacity() method. Logging the capacity before and after calling reAlloc() shows that it's always 0.
Debugging further, it seems like the value capacity of the internalStruct in the UnionVector always returns 0 because it has no children so size is 0.
@Override
public int getValueCapacity() {
return Math.min(getTypeBufferValueCapacity(), internalStruct.getValueCapacity());
}
Steps to reproduce
@Test
public void testAppendEmptyTargetUnionVector() {
final int length = 5;
try (final UnionVector target = UnionVector.empty("target", allocator);
final UnionVector delta = UnionVector.empty("delta", allocator)) {
// populate the delta vector
delta.setType(0, Types.MinorType.FLOAT4);
delta.setType(1, Types.MinorType.FLOAT4);
delta.setType(2, Types.MinorType.FLOAT4);
delta.setType(3, Types.MinorType.FLOAT4);
delta.setType(4, Types.MinorType.FLOAT4);
Float4Vector deltaFloatVector = delta.getFloat4Vector();
deltaFloatVector.allocateNew();
ValueVectorDataPopulator.setVector(deltaFloatVector, 1f, 2f, 3f, 4f, 5f);
assertEquals(length, deltaFloatVector.getValueCount());
delta.setValueCount(length);
VectorAppender appender = new VectorAppender(target);
delta.accept(appender, null);
assertEquals(length, target.getValueCount());
for (int i = 0; i < length; i++) {
Object floatObj = target.getObject(i);
assertTrue(floatObj instanceof Float);
assertEquals(i+1, ((Float) floatObj).intValue());
}
}
}
This issue does not occur if any value is set in the target vector before appending.
Describe the bug, including details regarding any error messages, version, and platform.
Description:
When appending a
UnionVectorto an empty targetUnionVector, this while loop runs infinitely until the exception occurs:It seems to be a issue with the
UnionVector.getValueCapacity()method. Logging the capacity before and after callingreAlloc()shows that it's always0.Debugging further, it seems like the value capacity of the
internalStructin theUnionVectoralways returns0because it has no children so size is0.Steps to reproduce
This issue does not occur if any value is set in the target vector before appending.