Method _flatten

python/pathway/internals/table.py:2380–2403

(
        self,
        flatten_name: str,
    )

    @contextualized_operator
    def _flatten(
        self,
        flatten_name: str,
    ) -> Table:
        flatten_column = self._columns[flatten_name]

        context = clmn.FlattenContext(
            orig_universe=self._universe,
            flatten_column=flatten_column,
        )

        columns = {
            name: self._wrap_column_in_context(context, column, name)
            for name, column in self._columns.items()
            if name != flatten_name
        }

        return Table(
            _columns={
                flatten_name: context.flatten_result_column,
                **columns,
            },
            _context=context,
        )

    @trace_user_frame
    @desugar