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Re: Debugging Gandiva failures in python CI tests



> On Dec 28, 2018, at 1:38 AM, Wes McKinney <wesmckinn@xxxxxxxxx> wrote:
> 
> You might have to wait for Antoine's help after the holidays. In the
> meantime: do you get the error when building both with gcc 4.8/4.9 and
> clang-6.0? I did a bit of google searching and it seems that iostream
> is a common troublemaker for LLVM. I wonder if the code can be
> refactored to avoid using std::cout

Thanks Wes.

I’ll wait for Antoine. In the meanwhile, I’ll work on the refactoring, just in case.


> 
> On Thu, Dec 27, 2018 at 3:56 AM Ravindra Pindikura <ravindra@xxxxxxxxxx> wrote:
>> 
>> Thanks Wes, that worked.
>> 
>> When I run the gandiva tests (I did a step-through with pdb), I get this error :
>> 
>>> /home/ravindra/git/arrow/python/pyarrow/tests/test_gandiva.py(50)test_tree_exp_builder()
>> -> schema, [expr], pa.default_memory_pool())
>> (Pdb)
>> LLVM ERROR: Program used external function '_ZNSt8ios_base4InitC1Ev' which could not be resolved!
>> 
>> I had hit the same issue with java/jni, and resolved it by doing a NativeLibrary.getInstance() (thanks to @pitrou). My knowledge of python is limited - can someone please help with the same for python ?
>> 
>> Thanks & regards,
>> ravindra.
>> 
>>> On Dec 26, 2018, at 7:55 PM, Wes McKinney <wesmckinn@xxxxxxxxx> wrote:
>>> 
>>> hi Ravindra,
>>> 
>>> If you are using Anaconda, you need to use the conda instructions for
>>> environment setup instead of virtualenv. This should be called out
>>> more prominently in a warning in the docs
>>> 
>>> - Wes
>>> 
>>> On Tue, Dec 25, 2018 at 12:53 PM Ravindra Pindikura <ravindra@xxxxxxxxxx> wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> My change (decimal support in gandiva) causes a CI failure in python test_gandiva.py
>>>> 
>>>> https://travis-ci.org/apache/arrow/jobs/471874254#L7167
>>>> 
>>>> However, the travis log has no further information on the failure.
>>>> 
>>>> To debug this, I tried setting up a python dev environment on ubuntu 14  using the steps in https://github.com/apache/arrow/blob/master/docs/source/python/development.rst
>>>> 
>>>> I got stuck at this (virtualenv pyarrow):
>>>> 
>>>> ValueError: failed to parse CPython sys.version: '3.6.7 |Anaconda, Inc.| (default, Oct 23 2018, 19:19:38) \n[GCC 7.3.0]'
>>>> 
>>>> 
>>>> Is this a known issue ? Any workaround ?
>>>> 
>>>> Thanks & regards,
>>>> Ravindra.
>>>> 
>>>> 
>>