Zeros in the result of mkl_sparse_spmm

Hello,

Per https://software.intel.com/en-us/mkl-developer-reference-c-sparse-blas-c... a matrix stored in CSR storage format should contain only non-zero values.  

We've ran into a case where the result of mkl_sparse_spmm contains some zero values. Is this expected? I can provide a repro if needed.

Thanks,

Sid