rdblue opened a new pull request, #5215:
URL: https://github.com/apache/iceberg/pull/5215

   #3959 updated `MetricsConfig` to stop writing metrics by default for tables 
with more than 32 columns. The intent was to avoid having too much metadata 
stored as stats in manifest files, but the implementation stopped writing 
metrics for all columns after a table reached 32 columns, which caused a large 
change in table performance after a table grows to 32+ columns.
   
   This updates the logic so that the first 32 columns still have metrics, but 
no new metrics are stored for columns after that point unless the table has a 
global default set or columns are individually configured.


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