deniskuzZ commented on code in PR #5804:
URL: https://github.com/apache/hive/pull/5804#discussion_r2085514269


##########
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/model/MColumnDescriptor.java:
##########
@@ -29,23 +30,33 @@
  * A wrapper around a list of columns.
  */
 public class MColumnDescriptor {
-  private List<MFieldSchema> cols;
+  private List<MColumn> columns;
+  private long id;
 
   public MColumnDescriptor() {}
 
-  /**
-   *
-   * @param cols
-   */
   public MColumnDescriptor(List<MFieldSchema> cols) {
-    this.cols = cols;
+    columns = new ArrayList<>(cols.size());
+    for (MFieldSchema schema : cols) {
+      columns.add(new MColumn(schema.getName(), schema.getType(), 
schema.getComment()));
+    }
+  }
+
+  public List<MColumn> getColumns() {
+    return columns;
   }
 
   public List<MFieldSchema> getCols() {
-    return cols;
+    List<MFieldSchema> schemas = new ArrayList<>();
+    if (getColumns() != null) {

Review Comment:
   i understand that, but why do you need to reconstruct the `getCols() ` 
representation
   {code}
     private List<MColumn> fields;
     private long id;
   
     private List<MFieldSchema> cols;
   
     public MColumnDescriptor(List<MFieldSchema> cols) {
       this.cols = cols;
       
       this.fields = cols.stream().map(schema ->
           new MColumn(schema.getName(), schema.getType(), schema.getComment()))
               .collect(Collectors.toList());
     }
   
     public List<MColumn> getFields() {
       return fields;
     }
   
     public List<MFieldSchema> getCols() {
        return cols
     }
   {code}



##########
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/model/MColumnDescriptor.java:
##########
@@ -29,23 +30,33 @@
  * A wrapper around a list of columns.
  */
 public class MColumnDescriptor {
-  private List<MFieldSchema> cols;
+  private List<MColumn> columns;
+  private long id;
 
   public MColumnDescriptor() {}
 
-  /**
-   *
-   * @param cols
-   */
   public MColumnDescriptor(List<MFieldSchema> cols) {
-    this.cols = cols;
+    columns = new ArrayList<>(cols.size());
+    for (MFieldSchema schema : cols) {
+      columns.add(new MColumn(schema.getName(), schema.getType(), 
schema.getComment()));
+    }
+  }
+
+  public List<MColumn> getColumns() {
+    return columns;
   }
 
   public List<MFieldSchema> getCols() {
-    return cols;
+    List<MFieldSchema> schemas = new ArrayList<>();
+    if (getColumns() != null) {

Review Comment:
   i understand that, but why do you need to reconstruct the `getCols() ` 
representation
   ````
     private List<MColumn> fields;
     private long id;
   
     private List<MFieldSchema> cols;
   
     public MColumnDescriptor(List<MFieldSchema> cols) {
       this.cols = cols;
       
       this.fields = cols.stream().map(schema ->
           new MColumn(schema.getName(), schema.getType(), schema.getComment()))
               .collect(Collectors.toList());
     }
   
     public List<MColumn> getFields() {
       return fields;
     }
   
     public List<MFieldSchema> getCols() {
        return cols
     }
   ````



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