if (this.endpointAffinities == null) {
BlockMapBuilder bmb = new BlockMapBuilder(fs, formatPlugin.getContext().getBits());
try{
for (RowGroupInfo rgi : rowGroupInfos) {
EndpointByteMap ebm = bmb.getEndpointByteMap(rgi);
rgi.setEndpointByteMap(ebm);
}
} catch (IOException e) {
logger.warn("Failure while determining operator affinity.", e);
return Collections.emptyList();