@Override
        public void printNode(final StringBuilder sb) {
            final TermNode termNode = this;
            sb.append(termNode.getTag());
            sb.append(condition.getDisplayValue());
            sb.append(termNode.getValue());
        }
This class represents an actual filter term node in the filter tree, i.e.
X=Y
stroom-statistics/stroom-statistics-impl-sql/src/main/java/stroom/statistics/impl/sql/search/FilterTermsTree.java