@Override
        public FlatResultBuilderImpl structure(List<Column> structure) {
            this.structure = structure;
            return this;
        }
Add headings to our data

@param structure the columns which act as headings for our data
@return The {@link FlatResultBuilderImpl}, enabling method chaining
stroom-query/stroom-query-api/src/main/java/stroom/query/api/FlatResult.java