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MDEV-25069: Assertion `root->weight >= ...' failed in SEL_ARG::tree_delete #2

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Note they key_or() may call tree_delete(), which will cause the weight
asserts to be checked. In order to avoid them from firing, update key1
tree's weight after we've changed key1->some_local_child->next_key_part.

Having done that, do we still need this at the function end:

  /* Re-compute the result tree's weight. */
  key1->update_weight_locally();
?
This commit is contained in:
Sergei Petrunia
2021-03-17 16:51:56 +03:00
parent 7e3806ce24
commit 9c7bd4f283
3 changed files with 25 additions and 0 deletions
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6
sql/opt_range.cc
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@@ -10642,9 +10642,15 @@ key_or(RANGE_OPT_PARAM *param, SEL_ARG *key1,SEL_ARG *key2)
*/
tmp->maybe_flag|= key2_cpy.maybe_flag;
key2_cpy.increment_use_count(key1->use_count+1);
uint old_weight= tmp->next_key_part? tmp->next_key_part->weight: 0;
tmp->next_key_part= key_or(param, tmp->next_key_part,
key2_cpy.next_key_part);
uint new_weight= tmp->next_key_part? tmp->next_key_part->weight: 0;
key1->weight += (new_weight - old_weight);
if (!cmp)
break; // case b: done with this key2 range