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MDEV-6950 Bad results with joins comparing DATE/DATETIME and INT/DECIMAL/DOUBLE/ENUM/VARCHAR columns

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MDEV-6971 Bad results with joins comparing TIME and DOUBLE/DECIMAL columns
Disallow using indexes on non-temporal columns to optimize
ref access, range access and table elimination when the counterpart's
cmp_type is TIME_RESULT, e.g.:
  SELECT * FROM t1 WHERE indexed_int_column=time_expression;
Only index on a temporal column can be used to optimize temporal comparison
operations.
This commit is contained in:
Alexander Barkov
2014-11-18 16:33:29 +04:00
parent 807934d083
commit e52b1637e0
15 changed files with 505 additions and 0 deletions
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2
sql/opt_range.cc
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@@ -8252,6 +8252,8 @@ get_mm_leaf(RANGE_OPT_PARAM *param, COND *conf_func, Field *field,
!(conf_func->compare_collation()->state & MY_CS_BINSORT &&
(type == Item_func::EQUAL_FUNC || type == Item_func::EQ_FUNC)))
goto end;
if (value->cmp_type() == TIME_RESULT && field->cmp_type() != TIME_RESULT)
goto end;
if (key_part->image_type == Field::itMBR)
{