anoopj commented on code in PR #2952:
URL: https://github.com/apache/iceberg-rust/pull/2952#discussion_r3713684556


##########
crates/iceberg/src/scan/task.rs:
##########
@@ -67,6 +67,21 @@ pub struct FileScanTask {
     #[builder(default)]
     pub record_count: Option<u64>,
 
+    /// The first row id assigned to the data file.
+    ///
+    /// Used to derive the `_row_id` metadata column: for a row without an
+    /// explicit `_row_id`, it is this value plus the row's ordinal position.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[builder(default)]
+    pub first_row_id: Option<i64>,
+
+    /// The data sequence number of the data file.

Review Comment:
    Reworded to call out the data-vs-file distinction explicitly and noted the 
null case. 



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