private Map<String, Integer> updateFieldPositionbMap() {
        final Map<String, Integer> fieldPositionMap = createFieldPositionMap();
        this.fieldPositionMap = fieldPositionMap;
        return fieldPositionMap;
    }
Held in a set to prevent duplicates.
<p>
XMLTransient to force JAXB to use the setter
stroom-core-shared/src/main/java/stroom/statistics/impl/sql/shared/StatisticsDataSourceData.java