Reduce the clone() cost of Statistics by caching #15614
Description
Wrapping the Statistics with `Arc<>'`s can be a solution?
Some structs like FileGroup, PartitionedData etc. caches the Statistics. So, if the source operators can access those, they should return over them. However, for other intermediate operators, perhaps we can utilize PlanProperties? The Statistics will be initiated once and cached like other planning properties
Originally posted by @berkaysynnada in #15503 (comment)