Github user rxin commented on the issue:
https://github.com/apache/spark/pull/16401
@wzhfy I thought about this more. Why don't we just get rid of the existing
"def statistics", and keep only one function
```
def statistics(conf: CatalystConf): Statistics
```
this one returns either the old stats or the new CBO based one based on the
config, and doesn't do caching?
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