marton-bod commented on a change in pull request #2178:
URL: https://github.com/apache/hive/pull/2178#discussion_r613123089



##########
File path: 
iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/HiveIcebergOutputCommitter.java
##########
@@ -143,19 +145,30 @@ public void commitJob(JobContext originalContext) throws 
IOException {
     LOG.info("Committing job has started for table: {}, using location: {}", 
table,
         generateJobLocation(conf, jobContext.getJobID()));
 
-    FileIO io = HiveIcebergStorageHandler.io(jobContext.getJobConf());
-    List<DataFile> dataFiles = dataFiles(jobContext, io, true);
-
-    if (dataFiles.size() > 0) {
+    List<DataFile> dataFiles = dataFiles(jobContext, table.io(), true);
+
+    boolean isOverwrite = conf.getBoolean(InputFormatConfig.IS_OVERWRITE, 
false);
+    if (isOverwrite) {
+      // Replacing affected partitions (or whole table) since it's an insert 
overwrite
+      // We do the replacement even for 0 data files (i.e. empty source)
+      ReplacePartitions overwrite = table.newReplacePartitions();
+      dataFiles.forEach(overwrite::addFile);
+      overwrite.commit();

Review comment:
       Never mind, it just makes sure that an exception is thrown if we're 
overwriting (deleting) any existing data




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