[michaelstaib]

A step in a Fusion operation plan can now carry "condition alternatives" next to its conditions. Until now a step could only say "skip me when any one of these @skip/@include conditions fails". With alternatives it can also say "run me only when at least one of these groups of conditions passes". The plan JSON and YAML formats write the new conditionAlternatives property, and the plan JSON format version moves from 1.2.0 to 1.3.0. The planner does not produce alternatives yet, so no existing plan changes; the follow-up PR in this stack does that.

Example

A step that fetches two fields, each behind its own @skip variable:

query ($skipDetails: Boolean!, $skipInventory: Boolean!) {
  product {
    id
    details @skip(if: $skipDetails) { color }
    inventory @skip(if: $skipInventory) { inStock }
  }
}

The step that fetches details and inventory can now be described like this in the plan:

{
  "id": 2,
  "type": "Operation",
  "conditionAlternatives": [
    [{ "variable": "$skipDetails", "passingValue": false }],
    [{ "variable": "$skipInventory", "passingValue": false }]
  ]
}

The step runs when $skipDetails is false or $skipInventory is false. When both are true, nothing is left to fetch and the step is skipped.

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Patch coverage

100.0% of changed lines covered (123/123)

File	Covered	Changed	Patch %
…/Execution/Nodes/ApolloOperationBatchExecutionNode.cs	1	1	100.0% 🟢
…/Execution/Nodes/ApolloOperationExecutionNode.cs	5	5	100.0% 🟢
…/Fusion.Execution/Execution/Nodes/BatchOperationDefinition.cs	1	1	100.0% 🟢
…/Fusion/src/Fusion.Execution/Execution/Nodes/ExecutionNode.cs	23	23	100.0% 🟢
…/Execution/Nodes/OperationBatchExecutionNode.cs	1	1	100.0% 🟢
…/src/Fusion.Execution/Execution/Nodes/OperationDefinition.cs	3	3	100.0% 🟢
…/Fusion.Execution/Execution/Nodes/OperationExecutionNode.cs	3	3	100.0% 🟢
…/Execution/Nodes/Serialization/JsonOperationPlanFormatter.cs	26	26	100.0% 🟢
…/Execution/Nodes/Serialization/JsonOperationPlanParser.cs	30	30	100.0% 🟢
…/Execution/Nodes/Serialization/YamlOperationPlanFormatter.cs	23	23	100.0% 🟢
…/Execution/Nodes/SingleOperationDefinition.cs	1	1	100.0% 🟢
…/Planning/OperationPlanner.BuildExecutionTree.cs	6	6	100.0% 🟢

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Project coverage: 59.5% (322088/541353 lines)