Fix Iceberg MV failure after table roll back

trinodb · Jul 12, 2023 · 0bbc949 · 0bbc949
1 parent 9845e7a
commit 0bbc949
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Showing 2 changed files with 41 additions and 1 deletion.
diff --git a/plugin/trino-iceberg/src/main/java/io/trino/plugin/iceberg/IcebergUtil.java b/plugin/trino-iceberg/src/main/java/io/trino/plugin/iceberg/IcebergUtil.java
@@ -658,7 +658,11 @@ public static Optional<Snapshot> firstSnapshotAfter(Table table, long baseSnapsh
         checkArgument(current.snapshotId() != baseSnapshotId, "No snapshot after %s in %s, current snapshot is %s", baseSnapshotId, table, current);
 
         while (true) {
-            checkArgument(current.parentId() != null, "Snapshot id %s is not valid in table %s, snapshot %s has no parent", baseSnapshotId, table, current);
+            if (current.parentId() == null) {
+                // Current is the first snapshot in the table, which means we reached end of table history not finding baseSnapshotId. This is possible
+                // when table was rolled back and baseSnapshotId is no longer referenced.
+                return Optional.empty();
+            }
             if (current.parentId() == baseSnapshotId) {
                 return Optional.of(current);
             }

diff --git a/.../trino-iceberg/src/test/java/io/trino/plugin/iceberg/BaseIcebergMaterializedViewTest.java b/.../trino-iceberg/src/test/java/io/trino/plugin/iceberg/BaseIcebergMaterializedViewTest.java
@@ -449,6 +449,37 @@ public void testMaterializedViewOnExpiredTable()
         assertUpdate("DROP MATERIALIZED VIEW mv_on_expired_the_mv");
     }
 
+    @Test
+    public void testMaterializedViewOnTableRolledBack()
+    {
+        assertUpdate("CREATE TABLE mv_on_rolled_back_base_table(a integer)");
+        assertUpdate("""
+                CREATE MATERIALIZED VIEW mv_on_rolled_back_the_mv
+                GRACE PERIOD INTERVAL '0' SECOND
+                AS SELECT sum(a) s FROM mv_on_rolled_back_base_table""");
+
+        // Create some snapshots
+        assertUpdate("INSERT INTO mv_on_rolled_back_base_table VALUES 4", 1);
+        long firstSnapshot = getLatestSnapshotId("mv_on_rolled_back_base_table");
+        assertUpdate("INSERT INTO mv_on_rolled_back_base_table VALUES 8", 1);
+
+        // Base MV on a snapshot "in the future"
+        assertUpdate("REFRESH MATERIALIZED VIEW mv_on_rolled_back_the_mv", 1);
+        assertUpdate(format("CALL system.rollback_to_snapshot(CURRENT_SCHEMA, 'mv_on_rolled_back_base_table', %s)", firstSnapshot));
+
+        // View still can be queried
+        assertThat(query("TABLE mv_on_rolled_back_the_mv"))
+                .matches("VALUES BIGINT '4'");
+
+        // View can also be refreshed
+        assertUpdate("REFRESH MATERIALIZED VIEW mv_on_rolled_back_the_mv", 1);
+        assertThat(query("TABLE mv_on_rolled_back_the_mv"))
+                .matches("VALUES BIGINT '4'");
+
+        assertUpdate("DROP TABLE mv_on_rolled_back_base_table");
+        assertUpdate("DROP MATERIALIZED VIEW mv_on_rolled_back_the_mv");
+    }
+
     @Test
     public void testSqlFeatures()
     {
@@ -763,4 +794,9 @@ private SchemaTableName getStorageTable(String catalogName, String schemaName, S
         assertThat(materializedView).isPresent();
         return materializedView.get().getStorageTable().get().getSchemaTableName();
     }
+
+    private long getLatestSnapshotId(String tableName)
+    {
+        return (long) computeScalar(format("SELECT snapshot_id FROM \"%s$snapshots\" ORDER BY committed_at DESC FETCH FIRST 1 ROW WITH TIES", tableName));
+    }
 }