You need to resolve and bind the encoder.
ExpressionEncoder<Row> enconder = RowEncoder.apply(struct).resolveAndBind();
Andy Dang wrote
> Hi all,
> (cc-ing dev since I've hit some developer API corner)
>
> What's the best way to convert an InternalRow to a Row if I've got an
> InternalRow and the corresponding Schema.
>
> Code snippet:
> @Test
> public void foo() throws Exception {
> Row row = RowFactory.create(1);
> StructType struct = new StructType().add("id",
> DataTypes.IntegerType);
> ExpressionEncoder
> <Row>
> enconder = RowEncoder.apply(struct);
> InternalRow internalRow = enconder.toRow(row);
> System.out.println("Internal row size: " +
> internalRow.numFields());
> Row roundTrip = enconder.fromRow(internalRow);
> System.out.println("Round trip: " + roundTrip.size());
> }
>
> The code fails at the line encoder.fromRow() with the exception:
>> Caused by: java.lang.UnsupportedOperationException: Cannot evaluate
> expression: getcolumnbyordinal(0, IntegerType)
>
> -------
> Regards,
> Andy
-----
Liang-Chi Hsieh | @viirya
Spark Technology Center
http://www.spark.tc/
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