code: protected function extractColumnType($column, $dbType, $precision, $scale, $length)
      {
          $column->dbType = $dbType;
  
          if (strpos($dbType, 'FLOAT') !== false || strpos($dbType, 'DOUBLE') !== false) {
              $column->type = 'double';
          } elseif (strpos($dbType, 'NUMBER') !== false) {
              if ($scale === null || $scale > 0) {
                  $column->type = 'decimal';
              } else {
                  $column->type = 'integer';
              }
          } elseif (strpos($dbType, 'INTEGER') !== false) {
              $column->type = 'integer';
          } elseif (strpos($dbType, 'BLOB') !== false) {
              $column->type = 'binary';
          } elseif (strpos($dbType, 'CLOB') !== false) {
              $column->type = 'text';
          } elseif (strpos($dbType, 'TIMESTAMP') !== false) {
              $column->type = 'timestamp';
          } else {
              $column->type = 'string';
          }
      }
docs: Extracts the data types for the given column.
  @param ColumnSchema $column
  @param string $dbType DB type
  @param string $precision total number of digits.
  This parameter is available since version 2.0.4.
  @param string $scale number of digits on the right of the decimal separator.
  This parameter is available since version 2.0.4.
  @param string $length length for character types.
  This parameter is available since version 2.0.4.