ulysses you created SPARK-34725:
-----------------------------------

             Summary: Do not show Statistics(sizeInBytes=8.0 EiB) if we don't 
have valid stats
                 Key: SPARK-34725
                 URL: https://issues.apache.org/jira/browse/SPARK-34725
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.2.0
            Reporter: ulysses you


In cast explian mode, we might get such explain string if the table is external 
and we have not stats.

 
{code:java}
== Optimized Logical Plan == 
GlobalLimit 21, Statistics(sizeInBytes=1008.0 B, rowCount=21)
 +- LocalLimit 21, Statistics(sizeInBytes=12.0 EiB)
 +- Project [cast(c1#52 as string) AS c1#259, pt#53], 
Statistics(sizeInBytes=12.0 EiB)
 +- Relation default.pt1[c1#52,pt#53] parquet, Statistics(sizeInBytes=8.0 EiB)
{code}
 

The reason is we use the `Long.MaxValue` as the stats with conf 
`spark.sql.defaultSizeInBytes`. It would be better to hide the default stat.



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