| 254 | return s; |
| 255 | } |
| 256 | String *std(String *s, ha_rows rows) |
| 257 | { |
| 258 | double tmp = ulonglong2double(rows); |
| 259 | if (!(tmp - nulls)) |
| 260 | s->set_real((double) 0.0, 1,my_thd_charset); |
| 261 | else |
| 262 | { |
| 263 | double tmp2 = ((sum_sqr - sum * sum / (tmp - nulls)) / |
| 264 | (tmp - nulls)); |
| 265 | s->set_real(((double) tmp2 <= 0.0 ? 0.0 : sqrt(tmp2)), DEC_IN_AVG,my_thd_charset); |
| 266 | } |
| 267 | return s; |
| 268 | } |
| 269 | friend int collect_longlong(longlong *element, element_count count, |
| 270 | TREE_INFO *info); |
| 271 | tree_walk_action collect_enum() |