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MDEV-12293 Assertion `table->no_keyread || !table->covering_keys.is_set(tab->index) || table->file->keyread == tab->index' failed

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sometimes the optimizer starts a keyread on some index
and later (but before any actual index accesses) changes
it to a keyread on a different index
This commit is contained in:
Sergei Golubchik
2017-04-18 17:44:30 +02:00
parent 54e24fcbd5
commit d17093b2ed
3 changed files with 18 additions and 3 deletions
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5
sql/handler.h
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@ -2858,10 +2858,9 @@ public:
bool keyread_enabled() { return keyread < MAX_KEY; }
int ha_start_keyread(uint idx)
{
if (keyread_enabled())
return 0;
int res= keyread_enabled() ? 0 : extra(HA_EXTRA_KEYREAD);
keyread= idx;
return extra(HA_EXTRA_KEYREAD);
return res;
}
int ha_end_keyread()
{