Via https://www.mongodb.com/community/forums/t/pymongoarrow-data-loss/298793/5?u=alex_clark

 
 
Steve_Silvester[MongoDB Employee|https://www.mongodb.com/community/forums/g/Employees]
2d
 
Hi @Leonid_Posadskov, that error most likely means that you have run out of memory in the memory pool that PyArrow uses to store the data. We are going to make the error more obvious in the next release. For now, I would suggest adding filters to limit the number of matching documents and break up your queries.