gandiva | Vectorized processing for Apache Arrow
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kandi X-RAY | gandiva Summary
Vectorized processing for Apache Arrow
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QUESTION
I try to put Apache Arrow vector in Ignite, this is working fine when I turn off native persistence, but after I turn on native persistence, JVM is crashed every time. I create IntVector first then put it in Ignite:
...ANSWER
Answered 2021-Jun-01 at 11:11Apache Arrow utilizes a pretty similar idea of Java off-heap storage as Apache Ignite does. For Apache Arrow it means that objects like IntVector
don't actually store data in their on-heap layout. They just store a reference to a buffer containing an off-heap address
of a physical representation. Technically it's a long
offset pointing to a chunk of memory within JVM address space.
When you restart your JVM, address space changes. But in your Apache Ignite native persistence there's a record holding an old pointer. It leads to a SIGSEGV
because it's not in the JVM address anymore (in fact it doesn't even exist after a restart).
You could use Apache Arrow serialization machinery to store data permanently in Apache Ignite or even somewhere else. But in fact after that you're going to lose Apache Arrow preciousness as a fast in-memory columnar store. It was initially designed to share off-heap data across multiple data-processing solutions.
Therefore I believe that technically it could be possible to leverage Apache Ignite binary storage format. In that case a custom BinarySerializer should be implemented. After that it would be possible to use it with the Apache Arrow vector classes.
QUESTION
I'm trying to set up a data pipeline between Bloomberg and Python. I have a Bloomberg terminal, a Windows 64-bit machine, Python 3.7.4 and a Sublime Text environment up and working. My goal is to install the XBBG package: https://pypi.org/project/xbbg/.
I've followed the steps on https://pypi.org/project/xbbg/ and I have installed:
- Bloomberg C++ SDK version 3.12.1 or higher
- Bloomberg Open API (need to install manually as shown below)
- pdblp - pandas wrapper for Bloomberg Open API
- numpy, pandas, ruamel.yaml
However the pip install pyarrow
installation does not work (see traceback below), even when I tried earlier versions of pyarrow
.
ANSWER
Answered 2019-Jul-25 at 12:33pyarrow
requires 64-bit Python. Verify that you have 64-bit Python:
QUESTION
Maybe I'm missing something obvious, but for the life of me, I can't figure out how I can access the elements of an array after a Gandiva filter operation.
I have linked a minimal example which I compile like this:
...ANSWER
Answered 2018-Dec-14 at 18:24The SelectionVector
stores indices, so the type is unsigned
, the following works:
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