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Hello,
Yes, Collstats is different in AWS DocumentDB which is unsupported as per the doc. If you are using default values for partitioning, perhaps it is using the partitioner helper because no values are being passed. If you included specific partitioning values, perhaps it might skip calling the partitioner helper and won’t call upon $collStats. (as per this logic). Recommend to test this at your end as I havent tested before.
Alternatively, you might use a different partitioner, such as the HashPartitioner. or disable partitioning by setting the spark.mongodb.input.partitioner configuration property to none.
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