presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/systemtables/ColumnRangesSystemTable.java/ColumnRangesSystemTable/isIndexedType
class ColumnRangesSystemTable:    private static boolean isIndexedType(Type type)
    {
        // We only consider the following types in the column_ranges system table
        // Exclude INTEGER because we don't collect column stats for INTEGER type.
        // Exclude DOUBLE because Java double is not completely compatible with MySQL double
        // Exclude VARCHAR because they can be truncated
        return type.equals(BOOLEAN) || type.equals(BIGINT) || type.equals(DATE) || type.equals(TIMESTAMP);
    }