Steve M. Kim created ARROW-7342:
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Summary: [Java] offset buffer for vector of variable-width type
with zero value count is empty
Key: ARROW-7342
URL: https://issues.apache.org/jira/browse/ARROW-7342
Project: Apache Arrow
Issue Type: Bug
Components: Java
Reporter: Steve M. Kim
I am reporting what I think might be two related bugs in
{{org.apache.arrow.vector.BaseVariableWidthVector}}
# The offset buffer is initialized as empty. I expect that it to have 4 bytes
that represent the integer zero.
# The {{getBufferSize}} method returns 0 when value count is zero, instead of
4.
Compare to the pyarrow implementation, which I believe correctly populates the
offset buffer:
{code:java}
>>> import pyarrow as pa
>>> array = pa.array([], type=pa.binary())
>>> array <pyarrow.lib.BinaryArray object at 0x7f4f68b858e8>
[]
>>> print([b.hex().decode() for b in array.buffers()])
['', '00000000', '']
{code}
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