zhangbutao commented on code in PR #10661:
URL: https://github.com/apache/iceberg/pull/10661#discussion_r1669851520


##########
mr/src/main/java/org/apache/iceberg/mr/mapreduce/IcebergInputFormat.java:
##########
@@ -144,21 +147,32 @@ public List<InputSplit> getSplits(JobContext context) {
     InputFormatConfig.InMemoryDataModel model =
         conf.getEnum(
             InputFormatConfig.IN_MEMORY_DATA_MODEL, 
InputFormatConfig.InMemoryDataModel.GENERIC);
-    try (CloseableIterable<CombinedScanTask> tasksIterable = scan.planTasks()) 
{
-      Table serializableTable = SerializableTable.copyOf(table);
-      tasksIterable.forEach(
-          task -> {
-            if (applyResidual
-                && (model == InputFormatConfig.InMemoryDataModel.HIVE
-                    || model == InputFormatConfig.InMemoryDataModel.PIG)) {
-              // TODO: We do not support residual evaluation for HIVE and PIG 
in memory data model
-              // yet
-              checkResiduals(task);
-            }
-            splits.add(new IcebergSplit(serializableTable, conf, task));
-          });
-    } catch (IOException e) {
-      throw new UncheckedIOException(String.format("Failed to close table 
scan: %s", scan), e);
+    final ExecutorService workerPool =
+        ThreadPools.newWorkerPool(
+            "iceberg-plan-worker-pool",
+            conf.getInt(
+                SystemConfigs.WORKER_THREAD_POOL_SIZE.propertyKey(),
+                ThreadPools.WORKER_THREAD_POOL_SIZE));
+    try {
+      scan = scan.planWith(workerPool);

Review Comment:
   I want to confirm the test case.
   
   Are you using fetch task to do the simple query? like `select * from 
iceberg_tb_b`, by setting `hive.fetch.task.conversion=more`;
   
   if you use tez task to do the query, do you still have this ugi problem? by 
setting `hive.fetch.task.conversion=none`;
   



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