[GitHub] [hive] ayushtkn commented on a diff in pull request #3612: HIVE-26576: Alter table calls on Iceberg tables can inadvertently change metadata_location

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

ayushtkn commented on code in PR #3612:
URL: https://github.com/apache/hive/pull/3612#discussion_r984439963


##########
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergMetaHook.java:
##########
@@ -386,6 +405,13 @@ private void assertNotCrossTableMetadataLocationChange(Map<String, String> tblPa
                 icebergTable.name(), newMetadataLocation)
         );
       }
+      if (!currentMetadata.metadataFileLocation().equals(newMetadataLocation) &&
+          !context.getProperties().containsKey(MANUAL_ICEBERG_METADATA_LOCATION_CHANGE)) {
+        // If we got here then this is an alter table operation where the table to be changed had an Iceberg commit
+        // meanwhile. The base metadata locations differ, while we know that this wasn't an intentional, manual
+        // metadata_location set by a user. To protect the interim commit we need to refresh the metadata file location.
+        tblParams.put(BaseMetastoreTableOperations.METADATA_LOCATION_PROP, currentMetadata.metadataFileLocation());

Review Comment:
   Good to have a log line here, as a follow up as we discussed we can have some logic to figure out whether it is only a Stats upgrade & if so, make this Alter a NO-OP in future



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