[GitHub] [spark] cloud-fan commented on a diff in pull request #37228: [SPARK-37980][SQL] Extend METADATA column to support row indexes

[GitBox <gi...@apache.org>]

cloud-fan commented on code in PR #37228:
URL: https://github.com/apache/spark/pull/37228#discussion_r934581170


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sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormat.scala:
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@@ -220,10 +235,24 @@ object FileFormat {
           // the modificationTime from the file is in millisecond,
           // while internally, the TimestampType `file_modification_time` is stored in microsecond
           row.update(i, fileModificationTime * 1000L)
+        case ROW_INDEX =>
+          // Reserve the spot in the row for a LongType value. The metadata fields that have
+          // identical values for each row of the file are set by this function, while fields that
+          // have different values (such as row index) are set separately.
+          row.update(i, -1L)

Review Comment:
   when will we hit this default value of row index?



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