[SPARK-49831] Provide empty RuntimeVersions object to ClusterSpec.runtimeVersions by default
#140
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What changes were proposed in this pull request?
Like the other fields of
ClusterSpec, this PR aims to provide at least emptyRuntimeVersionsobject toClusterSpec.runtimeVersionsfield by default.Why are the changes needed?
Although
ClusterSpec.runtimeVersionsfield is a required field, it'snullcurrently by default because this should be provided by the users. However, technically, we can createRuntimeVersionsobject with null fields when we don't know the values ofRuntimeVersionclass fields. By providing this intermediate object by default, we can write a test case more easily in other modules.Does this PR introduce any user-facing change?
No.
How was this patch tested?
Pass the CIs with the updated test case.
Was this patch authored or co-authored using generative AI tooling?
No.