Fokko commented on issue #12845:
URL: https://github.com/apache/iceberg/issues/12845#issuecomment-2823677466

   Hey @littleDrew, as @wzx140 already indicated, Spark uses distributed 
planning. The problem is likely that you have a lot of metadata and data. This 
makes the query planning process slow. I see that you refer to the code of 
Iceberg 0.13, if you're still using that version, I would highly recommend 
updating to a more recent version. Distributed planning has been added in 1.4.0 
with Spark 3.4 and 3.5.
   
   Another thing to take into consideration is doing table maintenance, 
rewriting 
[data](https://iceberg.apache.org/docs/nightly/spark-procedures/#rewrite_data_files)
 and 
[metadata](https://iceberg.apache.org/docs/nightly/spark-procedures/#rewrite_manifests)
 can speed up queries quite a bit.


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