presto-main/src/main/java/io/prestosql/operator/scalar/RowHashCodeOperator.java/RowHashCodeOperator/hash
class RowHashCodeOperator:    @UsedByGeneratedCode
    public static long hash(Type rowType, Block block)
    {
        BlockBuilder blockBuilder = rowType.createBlockBuilder(null, 1);
        blockBuilder.appendStructure(block);
        return rowType.hash(blockBuilder.build(), 0);
    }