This will involve changing the 'distributedPlanLogic()' for DocumentSourceLookup. Note that only top-level $lookups should be allowed to run in parallel, and any nested $lookup stages in the pipeline should remain on the "merging" half of the pipeline and be run serially.
- depends on
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SERVER-39016 Make sharded $lookup queries run on non-primary shards able to target the primary shard
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- Closed
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- is related to
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SERVER-39179 Confirm that aggregate command comment is propagated by sharded $lookup / $graphLookup
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- Closed
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- Closed
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