title: How to merge hive table avro format with already existing main table having slightly different avro schema format
body: <p>There are 2 Hive avro formatted tables </p>
  
  <p>Main_Table, Table_A</p>
  
  <p>Main_Table already has data. Table_A avro schema has few additional columns compared to Main_Table. scenario is Table_A data has to be merged with Main_Table</p>
  
  <p>columns in Table_A are dynamic, it might change after few days.</p>
  
  <p>How to merge Table_A with Main_Table?</p>