Use Parquet statistics for count(*)

[Dandandan]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
Currently, we need to read some column in order to compute the number of records of the table correctly. For sources like Parquet however, we can use the table statistics instead.

Describe the solution you'd like
Create an optimization rule that uses the statistics and replaced the count expression with the statistics based size of the table (sum of row counts).

Describe alternatives you've considered

Additional context