presto-orc/src/main/java/io/prestosql/orc/writer/BooleanColumnWriter.java/BooleanColumnWriter/getColumnEncodings
class BooleanColumnWriter:    @Override
    public Map<OrcColumnId, ColumnEncoding> getColumnEncodings()
    {
        return ImmutableMap.of(columnId, COLUMN_ENCODING);
    }