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MDEV-10228: Delete missing rows with OR conditions

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Fix get_quick_keys(): When building range tree from a condition
in form

  keypart1=const AND (keypart2 < 0 OR keypart2>=0)

the SEL_ARG for keypart2 represents an interval (-inf, +inf).
However, the logic that sets UNIQUE_RANGE flag fails to recognize
this, and sets UNIQUE_RANGE flag if (keypart1, keypart2) covered
a unique key.
As a result, range access executor assumes the interval can have
at most one row and only reads the first row from it.
This commit is contained in:
Sergei Petrunia
2016-07-27 00:38:51 +03:00
parent 1b5da2ca49
commit 15ef38d2ea
3 changed files with 62 additions and 0 deletions
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2
sql/opt_range.cc
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@ -10409,8 +10409,10 @@ get_quick_keys(PARAM *param,QUICK_RANGE_SELECT *quick,KEY_PART *key,
KEY *table_key=quick->head->key_info+quick->index;
flag=EQ_RANGE;
if ((table_key->flags & HA_NOSAME) &&
min_part == key_tree->part &&
key_tree->part == table_key->key_parts-1)
{
DBUG_ASSERT(min_part == max_part);
if ((table_key->flags & HA_NULL_PART_KEY) &&
null_part_in_key(key,
param->min_key,