liquibase-core/src/main/java/liquibase/util/csv/opencsv/bean/ColumnPositionMappingStrategy.java
@Override
   public String getColumnName(int col) {
      return (col < columnMapping.length) ? columnMapping[col] : null;
   }
@Override
   public String getColumnName(int col) {
      return (col < columnMapping.length) ? columnMapping[col] : null;
   }
gets a column name.
@param col - position of the column.
@return - column name or null if col > number of mappings.