code: Integer getColScaleOrNull(int i) {
  
          ColumnSchema column;
          int          type;
  
          column = table.getColumn(i);
          type   = column.getDataType().getJDBCTypeCode();
  
          return Types.acceptsScaleCreateParam(type)
                 ? ValuePool.getInt(column.getDataType().scale)
                 : null;
      }
docs: Retrieves the declared (but not currently enforced) or implicit fixed
  number of digits to the right of the decimal point for exact numeric
  types.
  
  If the column's type precludes scale declaration, null is returned.
  
  @param i zero-based column index
  @return the fixed number of digits to the right of the decimal point
  for exact numeric types.