diff options
Diffstat (limited to 'innobase/btr/btr0cur.c')
| -rw-r--r-- | innobase/btr/btr0cur.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/innobase/btr/btr0cur.c b/innobase/btr/btr0cur.c index 2e9194ff30f..be201da4510 100644 --- a/innobase/btr/btr0cur.c +++ b/innobase/btr/btr0cur.c @@ -2717,8 +2717,11 @@ btr_estimate_number_of_different_key_vals( rec = page_rec_get_next(rec); } + if (n_cols == dict_index_get_n_unique_in_tree(index)) { - /* We add one because we know that the first record + + /* If there is more than one leaf page in the tree, + we add one because we know that the first record on the page certainly had a different prefix than the last record on the previous index page in the alphabetical order. Before this fix, if there was @@ -2726,7 +2729,11 @@ btr_estimate_number_of_different_key_vals( algorithm grossly underestimated the number of rows in the table. */ - n_diff[n_cols]++; + if (btr_page_get_prev(page, &mtr) != FIL_NULL + || btr_page_get_next(page, &mtr) != FIL_NULL) { + + n_diff[n_cols]++; + } } total_external_size += |