public Column getNewColumnFromOriginalColumn(final Column originalColumn) {
        return originalColumnToNewColumnMap.get(originalColumn);
    }
Test to see if a column has a pre-storage value filter

@param column The column to test.
@return True if a filter exists, false otherwise.
stroom-query/stroom-query-common/src/main/java/stroom/query/common/v2/ColumnMap.java