deniskuzZ commented on code in PR #5123:
URL: https://github.com/apache/hive/pull/5123#discussion_r1568995126


##########
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/compaction/IcebergMajorQueryCompactor.java:
##########
@@ -44,22 +51,69 @@ public boolean run(CompactorContext context) throws 
IOException, HiveException,
     Map<String, String> tblProperties = context.getTable().getParameters();
     LOG.debug("Initiating compaction for the {} table", compactTableName);
 
-    String compactionQuery = String.format("insert overwrite table %s select * 
from %<s",
-        compactTableName);
+    HiveConf conf = new HiveConf(context.getConf());
+    String partSpec = context.getCompactionInfo().partName;
+    String compactionQuery;
+
+    if (partSpec == null) {
+      HiveConf.setVar(conf, ConfVars.REWRITE_POLICY, 
RewritePolicy.ALL_PARTITIONS.name());
+      compactionQuery = String.format("insert overwrite table %s select * from 
%<s", compactTableName);
+    } else {
+      Table table = IcebergTableUtil.getTable(conf, context.getTable());
+      PartitionData partitionData = DataFiles.data(table.spec(), partSpec);
+      compactionQuery = String.format("insert overwrite table %1$s 
partition(%2$s) select * from %1$s where %3$s",
+          compactTableName, partDataToSQL(partitionData, partSpec, ","),
+          partDataToSQL(partitionData, partSpec, " and "));
+    }
+
+    SessionState sessionState = setupQueryCompactionSession(conf, 
context.getCompactionInfo(), tblProperties);
+    sessionState.setConf(conf);

Review Comment:
   how does it work then for ACID compactions? shouldn't we fix that in 
setUpSessionState and always update the conf?



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