Is CBO broken?

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Is CBO broken?

I was trying to enable CBO on one of our jobs (using Spark 2.3.1 with
partitioned parquet data) but it seemed that the rowCount statistics were
being ignored. I found this JIRA which seems to describe the same issue:, but it has no response so

Does CBO work with partitioned parquet data, or is this a known issue? Is
there a workaround?


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