Method field_real

sql/sql_analyse.h:185–188

public:
  field_real(Item* a, select_analyse* b) :field_info(a,b),
    min_arg(0), max_arg(0),  sum(0), sum_sqr(0), max_notzero_dec_len(0)
    { init_tree(&tree, 0, 0, sizeof(double),
		(qsort_cmp2) compare_double2, 0, NULL, NULL); }

  void	 add();
  void	 get_opt_type(String*, ha_rows);