Python based Extension Development API: ColumnParameter for input_table_group

Node Development
1

Hi all,

I’m using the Python Extension Development API. I want to set up a node with input_table_group to support an arbitrary number of input tables together with a ColumnParameter ParameterArray to select one column from each input table.

It seems like this is not yet implemented. Or is there any way to do this?

My current MWE where I tried to implement this:

@knext.parameter_group(label="Column Selection")
class ColSelections:
    colsel: knext.ColumnParameter = knext.ColumnParameter(
        label="Cols",
        description="Select cols",
        default_value=None,
    )

@knext.node(
    name="Cf Node",
    node_type=knext.NodeType.MANIPULATOR,
    icon_path="icons/daly_elephant_small-64-64.png",
    category=mtu_base_category,
)
@knext.input_table_group(
    name="Tables to Concatenate",
    description="Tables to concatenate to base table",
)
@knext.output_table(
    name="Output Table", description="Something"
)
class CfNode:
    """Do something."""

    col_selection: knext.ParameterArray = knext.ParameterArray(
        label="Column Selections",
        description="Select the columns.",
        parameters=ColSelections(),
        array_title="Selections",
    )

    def configure(
        self,
        configure_context: knext.ConfigurationContext,
        input_schemas: list[knext.Schema],
    ) -> knext.Schema:
        for pa, schema in zip(self.col_selection, input_schemas):
            pa.colsel.apply(schema)

        return input_schemas[0]

    def execute(
        self,
        exec_context: knext.ExecutionContext,
        input_tables: list[knext.Table],
    ) -> knext.Table:
        return input_tables[0]

I also tried implementing this in many different ways, but it seems like Knime does not yet support this?

Any help is appreciated.

Thanks in advance and best regards,

Johannes