flink-ml-lib/src/main/java/org/apache/flink/ml/feature/stringindexer/IndexToStringModel.java [86:106]:
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        modelDataTable = inputs[0];
        return this;
    }

    @Override
    public Table[] getModelData() {
        return new Table[] {modelDataTable};
    }

    @Override
    @SuppressWarnings("unchecked, rawtypes")
    public Table[] transform(Table... inputs) {
        Preconditions.checkArgument(inputs.length == 1);
        String[] inputCols = getInputCols();
        String[] outputCols = getOutputCols();
        Preconditions.checkArgument(inputCols.length == outputCols.length);
        StreamTableEnvironment tEnv =
                (StreamTableEnvironment) ((TableImpl) modelDataTable).getTableEnvironment();

        RowTypeInfo inputTypeInfo = TableUtils.getRowTypeInfo(inputs[0].getResolvedSchema());
        TypeInformation<?>[] outputTypes = new TypeInformation[outputCols.length];
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flink-ml-lib/src/main/java/org/apache/flink/ml/feature/stringindexer/StringIndexerModel.java [90:110]:
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        modelDataTable = inputs[0];
        return this;
    }

    @Override
    public Table[] getModelData() {
        return new Table[] {modelDataTable};
    }

    @Override
    @SuppressWarnings("unchecked, rawtypes")
    public Table[] transform(Table... inputs) {
        Preconditions.checkArgument(inputs.length == 1);
        String[] inputCols = getInputCols();
        String[] outputCols = getOutputCols();
        Preconditions.checkArgument(inputCols.length == outputCols.length);
        StreamTableEnvironment tEnv =
                (StreamTableEnvironment) ((TableImpl) modelDataTable).getTableEnvironment();

        RowTypeInfo inputTypeInfo = TableUtils.getRowTypeInfo(inputs[0].getResolvedSchema());
        TypeInformation<?>[] outputTypes = new TypeInformation[outputCols.length];
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