deniskuzZ commented on code in PR #5804:
URL: https://github.com/apache/hive/pull/5804#discussion_r2088293516


##########
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:
   My concern here is not about `fields`, but their transformed representation 
returned by `getCols()`.  Please check 
https://github.com/apache/hive/pull/5804#discussion_r2087230529
   



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