Retrieve current positions (offsets) for topics+partitions.
RD_KAFKA_RESP_ErrorCode.no_error on success in which case the
\p offset or \p err field of each \p partitions' element is filled
in with the stored offset, or a partition specific error.
Else returns an error code.
Retrieve current positions (offsets) for topics+partitions.
RD_KAFKA_RESP_ErrorCode.no_error on success in which case the \p offset or \p err field of each \p partitions' element is filled in with the stored offset, or a partition specific error. Else returns an error code.