presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/systemtables/TableMetadataSystemTable.java/TableMetadataSystemTable/writeArray
class TableMetadataSystemTable:    private static void writeArray(BlockBuilder blockBuilder, Collection<String> values)
    {
        if (values.isEmpty()) {
            blockBuilder.appendNull();
        }
        else {
            BlockBuilder array = blockBuilder.beginBlockEntry();
            for (String value : values) {
                VARCHAR.writeSlice(array, utf8Slice(value));
            }
            blockBuilder.closeEntry();
        }
    }