in src/main/java/com/spotify/bigtable/read/AbstractBigtableRead.java [103:112]
protected void addRowFilter(final RowFilter.Builder rowFilter) {
final RowFilter.Chain.Builder chain = readRequest.getFilter().getChain().toBuilder();
if (chain.getFiltersCount() == 0) {
// Chain must have at least 2 filters
chain.addFilters(RowFilter.getDefaultInstance());
}
chain.addFilters(rowFilter);
readRequest.setFilter(RowFilter.newBuilder().setChain(chain));
}