[I] Adding new columns (mergeSchema) [iceberg]

[via GitHub]

josgarmar14 opened a new issue, #8908:
URL: https://github.com/apache/iceberg/issues/8908

   ### Apache Iceberg version
   
   1.0.0
   
   ### Query engine
   
   Spark
   
   ### Please describe the bug 🐞
   
   Facing issue when creating a new iceberg snapshot with new schema. 
   **Code:**
   
`datasource_df.writeTo(f"job_catalog.{args['glue_db']}.{args['glue_iceberg_tablename']}").option("mergeSchema","true").overwritePartitions()`
   
   **Error:** 
   ```
   Cannot write incompatible dataset to table with schema:
   table {
     1: index: optional string
     2: name: optional string
     3: description: optional string
     4: createdby: optional string
     5: new_column: optional string
   }
   Provided schema:
   table {
     1: index: optional string
     5: new_column: optional string
     2: name: optional string
     3: description: optional string
     4: createdby: optional string
   }
   Problems:
   * new_column is out of order, before createdby
   ```
   I am using a Glue Job. Please provide insights on what is wrong. Thanks


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