class_docstr: Collection of InputToIssueSetMappingItems.
  
  This implements Sized to aid mf_pformat(). Sized is used in mf_pformat() when excluding display of empty items.
class_docstr_tok: ["Collection","of","InputToIssueSetMappingItems",".","This","implements","Sized","to","aid","mf_pformat","(",")",".","Sized","is","used","in","mf_pformat","(",")","when","excluding","display","of","empty","items","."]
code: def merge(
      self, other: InputToIssueSetMapping
  ) -> InputToIssueSetMapping:
      return InputToIssueSetMapping(items=self.items + other.items)
  
imports: from __future__ import annotations
  from dataclasses import dataclass
  from typing import Optional, Sized, Tuple
  from typing_extensions import override
  from metricflow.collection_helpers.merger import Mergeable
  from metricflow.mf_logging.pretty_print import mf_pformat
  from metricflow.query.group_by_item.filter_spec_resolution.filter_spec_lookup import FilterSpecResolutionLookUp
  from metricflow.query.group_by_item.resolution_dag.dag import GroupByItemResolutionDag
  from metricflow.query.issues.issues_base import MetricFlowQueryResolutionIssueSet
  from metricflow.query.resolver_inputs.base_resolver_inputs import MetricFlowQueryResolverInput
  from metricflow.specs.specs import MetricFlowQuerySpec
label_desc: Use image node_id 3 for calling the InputToIssueSetMapping obj's underlying member method code with example usage: obj.merge(other) and returns: InputToIssueSetMapping