code: public void deleteByColumn(String schemaName, String tableName, String columnName, Object columnValue)
      {
          DBCollection dbCollection = mongoDb.getCollection(tableName);
          BasicDBObject query = new BasicDBObject();
          query.put(columnName, columnValue);
          KunderaCoreUtils.printQuery("Delete column:" + query, showQuery);
          dbCollection.remove(query, getWriteConcern(), encoder);
      }
docs: /*
  (non-Javadoc)
  
  @see com.impetus.kundera.client.Client#deleteByColumn(java.lang.String,
  java.lang.String, java.lang.Object)