private InternalScanner buildScanner(String keyPrefix, String value, HRegion r)
throws IOException {
// Defaults FilterList.Operator.MUST_PASS_ALL.
FilterList allFilters = new FilterList();
allFilters.addFilter(new PrefixFilter(Bytes.toBytes(keyPrefix)));
// Only return rows where this column value exists in the row.
SingleColumnValueFilter filter =
new SingleColumnValueFilter(Bytes.toBytes("trans-tags"),
Bytes.toBytes("qual2"), CompareOp.EQUAL, Bytes.toBytes(value));
filter.setFilterIfMissing(true);