Indhumathi27 commented on a change in pull request #4113:
URL: https://github.com/apache/carbondata/pull/4113#discussion_r609374954



##########
File path: docs/ddl-of-carbondata.md
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@@ -646,6 +647,28 @@ CarbonData DDL statements are documented here,which 
includes:
 
 ## TABLE MANAGEMENT  
 
+### DESCRIBE COMMAND
+
+Describe column of table and visualize its structure with child fields.
+  ```
+  DESCRIBE COLUMN fieldname[.nestedFieldNames] ON [db_name.]table_name;
+
+  Example: DESCRIBE COLUMN channelsId ON carbonTable;

Review comment:
       Can add some examples to query Array child, since have to provide 
arr_name.item




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