comphead commented on PR #20358:
URL: https://github.com/apache/datafusion/pull/20358#issuecomment-3909917808

   > Warning that spark has `spark.sql.mapKeyDedupPolicy`
   > 
   > ```
   > spark.sql.mapKeyDedupPolicy | EXCEPTION | The policy to deduplicate map 
keys in builtin function: CreateMap, MapFromArrays, MapFromEntries, 
StringToMap, MapConcat and TransformKeys. When EXCEPTION, the query fails if 
duplicated map keys are detected. When LAST_WIN, the map key that is inserted 
at last takes precedence. | 3.0.0
   > ```
   > 
   > https://spark.apache.org/docs/latest/configuration.html
   
   this is a good point


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