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https://issues.apache.org/jira/browse/ARROW-2252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16385205#comment-16385205
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ASF GitHub Bot commented on ARROW-2252:
---------------------------------------
xhochy opened a new pull request #1693: ARROW-2252: [Python] Create buffer from
address, size and base
URL: https://github.com/apache/arrow/pull/1693
Usage with Arrow Java vectors:
```
import jpype
import numpy as np
import pyarrow as pa
import sys
# Start JVM with Arrow and all of its dependencies.
jpype.startJVM(getDefaultJVMPath(),
"-Djava.class.path=arrow-tools-0.9.0-SNAPSHOT-jar-with-dependencies.jar")
# Create vector
ra = jpype.JPackage("org").apache.arrow.memory.RootAllocator(sys.maxsize)
uint1 = jpype.JPackage("org").apache.arrow.vector.UInt1Vector("int", ra)
uint1.allocateNew(128)
for i in range(128):
uint1.setSafe(i, i)
uint1.setValueCount(128)
# Access it in Python
addr = uint1.getDataBuffer().unwrap().memoryAddress()
size = uint1.getDataBuffer().unwrap().capacity()
fb = pa.ForeignBuffer(addr, size, n)
np.asarray(fb)
```
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> [Python] Create buffer from address, size and base
> --------------------------------------------------
>
> Key: ARROW-2252
> URL: https://issues.apache.org/jira/browse/ARROW-2252
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Python
> Reporter: Uwe L. Korn
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.9.0
>
>
> Given a memory address and a size, we should be able to construct an Arrow
> buffer from this. The additional base object will be used to hold a reference
> to the underlying, original buffer so that it does not go out of scope before
> the Arrow buffer.
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