[GitHub] [iceberg] ajantha-bhat edited a comment on issue #3849: expire snapshot is deleting schema mapping from snapshots v0.12.1

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

ajantha-bhat edited a comment on issue #3849:
URL: https://github.com/apache/iceberg/issues/3849#issuecomment-1006286239


   @naveenkrdremio 
   I tried in 0.12.1 with my own testcase. I didn't face the issue. My testcase:
   
    ```
   sql("CREATE TABLE %s (id bigint NOT NULL, data string) USING iceberg", tableName);
   
       sql("INSERT INTO TABLE %s VALUES (1, 'a')", tableName);
       sql("INSERT INTO TABLE %s VALUES (2, 'b')", tableName);
   
       Table table = validationCatalog.loadTable(tableIdent);
   
       Assert.assertEquals("Should be 2 snapshots", 2, Iterables.size(table.snapshots()));
   
       waitUntilAfter(table.currentSnapshot().timestampMillis());
   
       sql("ALTER TABLE %s ADD COLUMN count1 int", tableName);
       sql("INSERT INTO TABLE %s VALUES (2, 'c', 10)", tableName);
   
       Timestamp currentTimestamp = Timestamp.from(Instant.ofEpochMilli(System.currentTimeMillis()));
   
       table = validationCatalog.loadTable(tableIdent);
       List<Long> id = new ArrayList<>();
       table.snapshots().forEach(x -> id.add(x.snapshotId()));
       table.expireSnapshots().expireSnapshotId(id.get(id.size() - 2)).commit();
   ```
   
   Few observations: 
   
   From your description, In V24 optional schema-id in the snapshots field is missing. But In V23 also I can see it is missing for the first snapshot. So, V23 is also result of previous expire snapshots ? 
   As Russell said better to narrow down further. 


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