code: public final Object get(String columnName, VoltType type) {
          final int colIndex = getColumnIndex(columnName);
          return get(colIndex, type);
      }
docs: Retrieve a value from the row by specifying the column name and the
  {@link VoltType type}. This method is slower then linking directly
  against the type specific getter. Prefer the type specific getter methods
  where viable. Looking at the return value is not a reliable way to check
  if the value is <tt>null</tt>. Use {@link #wasNull()} instead.
  
  @param columnName
  Name of the column
  @param type
  {@link VoltType} of the value
  @return The value or <tt>null</tt> if the value is not set.
  @see #wasNull()