Method _forget

python/pathway/internals/table.py:761–777

(
        self,
        threshold_column: expr.ColumnExpression,
        time_column: expr.ColumnExpression,
        mark_forgetting_records: bool,
        instance_column: expr.ColumnExpression | None = None,
    )

    @check_arg_types
    @contextualized_operator
    def _forget(
        self,
        threshold_column: expr.ColumnExpression,
        time_column: expr.ColumnExpression,
        mark_forgetting_records: bool,
        instance_column: expr.ColumnExpression | None = None,
    ) -> Table[TSchema]:
        if instance_column is None:
            instance_column = expr.ColumnConstExpression(None)
        context = clmn.ForgetContext(
            self._id_column,
            self._eval(threshold_column),
            self._eval(time_column),
            self._eval(instance_column),
            mark_forgetting_records,
        )
        return self._table_with_context(context)

    @trace_user_frame
    @desugar