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https://issues.apache.org/jira/browse/HIVE-27177?focusedWorklogId=854822&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-854822
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ASF GitHub Bot logged work on HIVE-27177:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 04/Apr/23 14:59
            Start Date: 04/Apr/23 14:59
    Worklog Time Spent: 10m 
      Work Description: deniskuzZ commented on code in PR #4155:
URL: https://github.com/apache/hive/pull/4155#discussion_r1157388147


##########
ql/src/java/org/apache/hadoop/hive/ql/ddl/table/convert/AlterTableConvertOperation.java:
##########
@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hive.ql.ddl.table.convert;
+
+
+import org.apache.hadoop.hive.ql.ddl.DDLOperationContext;
+import org.apache.hadoop.hive.ql.ddl.table.AbstractAlterTableOperation;
+import org.apache.hadoop.hive.ql.metadata.HiveException;
+import org.apache.hadoop.hive.ql.metadata.Partition;
+import org.apache.hadoop.hive.ql.metadata.Table;
+import org.apache.hadoop.hive.ql.parse.SemanticException;
+
+import java.util.Map;
+
+/**
+ * Operation process of ALTER TABLE ... CONVERT command
+ */
+public class AlterTableConvertOperation extends 
AbstractAlterTableOperation<AlterTableConvertDesc> {
+
+  private enum ConversionFormats {
+    ICEBERG("org.apache.iceberg.mr.hive.HiveIcebergStorageHandler");
+
+    private final String className;
+
+    ConversionFormats(String className) {
+      this.className = className;
+    }
+
+    public String className() {
+      return className;
+    }
+  }
+
+  public AlterTableConvertOperation(DDLOperationContext context, 
AlterTableConvertDesc desc) {
+    super(context, desc);
+  }
+
+  @Override
+  protected void doAlteration(Table table, Partition partition) throws 
HiveException {
+    // Add the covert type
+    String convertType = desc.getConvertSpec().getTargetType();
+    ConversionFormats format = ConversionFormats.valueOf(convertType);
+    if 
(format.className().equalsIgnoreCase(table.getParameters().get("storage_handler")))
 {

Review Comment:
   could we please use constant instead of string literal





Issue Time Tracking
-------------------

    Worklog Id:     (was: 854822)
    Time Spent: 1h 40m  (was: 1.5h)

> Add alter table...Convert to Iceberg command
> --------------------------------------------
>
>                 Key: HIVE-27177
>                 URL: https://issues.apache.org/jira/browse/HIVE-27177
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Ayush Saxena
>            Assignee: Ayush Saxena
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> Add an alter table <tblName> convert to Iceberg [TBLPROPERTIES('','')] to 
> convert exiting external tables to iceberg tables



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