branch-4.0: [fix](mtmv) Add null-safety to getBaseViewsOneLevel for backward compatibility #64412#64499
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…atibility (#64412) Introduced by #56423, the field baseViewsOneLevel may be null for MTMVs created before that PR. This causes NPE when querying information_schema.view_dependency: Cannot invoke java.util.Set.stream() because the return value of org.apache.doris.mtmv.MTMVRelation.getBaseViewsOneLevel() is null baseViewsOneLevel is currently only used for tablefunction/MetadataGenerator, so this change is safe. --------- Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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Cherry-picked from #64412