@Override
    public DataType setInputType(DataType inputType, TypeContext context) {
        super.setInputType(inputType, context);
        var outputType = getOutputType(context); // Cannot be determined from input
        validateInputAndOutput(inputType, outputType);
        return outputType;
    }
@return the requested embedder id. This will diverge from the selected embedder's id when executed in config-model
indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/EmbedExpression.java