rdblue commented on issue #173: Make collection of lower/upper bounds 
configurable
URL: 
https://github.com/apache/incubator-iceberg/issues/173#issuecomment-498070912
 
 
   I'd prefer the simpler table property approach because it can be configured 
using existing SQL DDL (`SET TBLPROPERTIES`). Here's what I would do to keep 
the configuration small:
   
   1. Define modes: `full`, `counts`, and `none` to express all metrics, just 
null/value counts, and no metrics
   2. Allow setting a column default: `metadata.metrics.default=full`
   3. Add column-level config: `metadata.metrics.column.(column-name)=counts` 
to allow per-column tuning
   
   That way, the configuration stays simple and users can choose how to 
minimize the amount of configuration properties they need to set by controlling 
the default and then updating individual columns from there.

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