rahil-c commented on code in PR #9695:
URL: https://github.com/apache/iceberg/pull/9695#discussion_r1495091041


##########
open-api/rest-catalog-open-api.yaml:
##########
@@ -2068,6 +2162,145 @@ components:
           items:
             $ref: '#/components/schemas/PartitionStatisticsFile'
 
+    PlanTask:
+      description:
+        A JSON object that contains information provided by the server,
+        to be utilized by clients for distributed planning, should be supplied
+        as is for input in PlanTable operation.
+      type: object
+
+    FileScanTask:
+      type: object
+      required:
+        - schema
+        - spec
+        - start
+        - length
+        - data-file
+      properties:
+        data-file:
+          $ref: '#/components/schemas/ContentFile'
+        partition:
+          type: object
+          additionalProperties:
+            type: string
+        size-bytes:
+          type: number
+        start:
+          type: number
+        length:
+          type: number
+        estimated-rows-count:
+          type: number
+        delete-files:
+          type: array
+          items:
+            $ref: '#/components/schemas/ContentFile'
+        schema:
+          $ref: '#/components/schemas/Schema'

Review Comment:
   When modeling this, I referred to the `FileScanTaskParser`
   
https://github.com/apache/iceberg/blob/main/core/src/main/java/org/apache/iceberg/FileScanTaskParser.java
 , which contains a field `SCHEMA`, that seems to not be null
   ```
     private static final String SCHEMA = "schema";
   
   generator.writeFieldName(SCHEMA);
       SchemaParser.toJson(fileScanTask.schema(), generator);
   ```
   For the type of schema it looks to be a table schema, my assumption is that 
the FileScanTaskParser is off of the BaseFileScanTask which has a reference to 
this Schema class. @stevenzwu 
   
   ```
   /**
    * The schema of a data table.
    *
    * <p>Schema ID will only be populated when reading from/writing to table 
metadata, otherwise it
    * will be default to 0.
    */
   public class Schema implements Serializable {
   
   ```
   
https://github.com/apache/iceberg/blob/5b84f34a5386fc61b17bfe7dc7c1cbe565550958/api/src/main/java/org/apache/iceberg/Schema.java#L51
   
   
   As 



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