[GitHub] [iceberg] findinpath commented on a change in pull request #3432: Doc: add a page to explain row-level deletes

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findinpath commented on a change in pull request #3432:
URL: https://github.com/apache/iceberg/pull/3432#discussion_r794513070



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File path: site/docs/row-level-deletes.md
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+
+# Row-Level Deletes
+
+Iceberg supports metadata-based deletion through the `DeleteFiles` interface.
+It allows you to quickly delete a specific file or any file that might match a given expression without the need to read or write any data in the table.
+
+Row-level deletes target more complicated use cases such as general data protection regulation (GDPR).
+Copy-on-write and merge-on-read are two different approaches to handle row-level delete operations. Here are their definitions in Iceberg:
+
+- **copy-on-write**: a delete directly rewrites all the affected data files.
+- **merge-on-read**: delete information is encoded in the form of _delete files_. The table reader can apply all delete information at read time.

Review comment:
       Does this mean that *each* time while performing a read operation, the reader needs to apply the delete information in order to get the current content of the table?




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