cloud-fan commented on code in PR #37228:
URL: https://github.com/apache/spark/pull/37228#discussion_r945892851
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sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormat.scala:
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@@ -182,18 +183,32 @@ object FileFormat {
val FILE_MODIFICATION_TIME = "file_modification_time"
+ val ROW_INDEX = "row_index"
+
+ // A name for a temporary column that holds row indexes computed by the file
format reader
+ // until they can be placed in the _metadata struct.
+ val ROW_INDEX_TEMPORARY_COLUMN_NAME = s"_tmp_metadata_$ROW_INDEX"
Review Comment:
we add this name because `row_index` is more likely to conflict with data
columns?
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