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Actually, I took a quick look, and it looks like the problem is that the 
code doesn't handle zero-length (but non-null) results. In this case, it 
looks like copyColumn needs to handle copying a zero-length string (or, 
maybe we just need to let escapeString have a zero-length quoted output).

I think we can patch this to fix the problem quickly (probably 3 lines 
or less), but we may need to verify that the proper syntax for importing 
into mysql. Can someone else open a ticket, implement it, test it, and 
shepherd it through to merging? Fritz? AndyS? Fabrice? I've got my hands 
full with preparing a talk.

Tatiana, I think you can work around this by making sure that none of 
your column values are empty strings.

Thanks,
-Daniel



On 01/22/2015 04:35 PM, Daniel L. Wang wrote:
> Hi Tatiana,
>
> It's only a known issue in the sense that Jacek posted that error from 
> you some day(s) in the past. We should open a ticket for it.
>
> My guess is that the error comes from intermediate results that 
> trigger an error condition when when gathering back results from the 
> cluster. It's likely due to a result type that we don't support(or 
> don't properly support). If you are selecting blobs or varchars or 
> binary or bit types, that could cause it, or maybe our code for 
> handling zero-length values is broken.
>
>
> -Daniel
>
>
> On 01/22/2015 04:28 PM, Tatiana Goldina wrote:
>> Hello,
>>
>> I am encountering this once in a while.
>>
>> qserv-czar.log
>>
>> python: build/rproc/ProtoRowBuffer.cc:69: int 
>> lsst::qserv::rproc::escapeString(Iter, CIter, CIter) [with Iter = 
>> __gnu_cxx::__normal_iterator<char*, std::vector<char, 
>> std::allocator<char> > >, CIter = __gnu_cxx::__normal_iterator<const 
>> char*, std::basic_string<char, std::char_traits<char>, 
>> std::allocator<char> > >]: Assertion `srcBegin != srcEnd' failed.
>>
>> Czar is dead and qserv stops responding after that.
>>
>>
>> Is it a known issue?
>>
>>
>> Thank you!
>>
>> Tatiana
>>
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