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| author | Alexey Kopytov <Alexey.Kopytov@Sun.com> | 2010-04-30 15:10:48 +0400 |
|---|---|---|
| committer | Alexey Kopytov <Alexey.Kopytov@Sun.com> | 2010-04-30 15:10:48 +0400 |
| commit | 97374a11849f3b61ed431c1abe75a283d765e859 (patch) | |
| tree | 23f9e399ede4ce1cc9f7110de694937f94df1d32 /mysql-test/r/ps.result | |
| parent | 6eca53f1d382a247456d29794c70338f972b77a9 (diff) | |
| download | mariadb-git-97374a11849f3b61ed431c1abe75a283d765e859.tar.gz | |
Bug #48419: another explain crash..
WHERE predicates containing references to empty tables in a
subquery were handled incorrectly by the optimizer when
executing EXPLAIN. As a result, the optimizer could try to
evaluate such predicates rather than just stop with
"Impossible WHERE noticed after reading const tables" as
it would do in a non-subquery case. This led to valgrind
errors and crashes.
Fixed the code checking the above condition so that subqueries
are not excluded and hence are handled in the same way as top
level SELECTs.
mysql-test/r/explain.result:
Added a test case for bug #48419.
mysql-test/r/ps.result:
Updated test results to take the new (and more correct)
"Extra" comments in execution plans.
mysql-test/t/explain.test:
Added a test case for bug #48419.
sql/sql_select.cc:
There is no point in excluding subqueries from checking
for identically false WHERE conditions.
Diffstat (limited to 'mysql-test/r/ps.result')
| -rw-r--r-- | mysql-test/r/ps.result | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/mysql-test/r/ps.result b/mysql-test/r/ps.result index cf08d763e5c..84b9cdf930c 100644 --- a/mysql-test/r/ps.result +++ b/mysql-test/r/ps.result @@ -155,24 +155,24 @@ execute stmt1 ; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 6 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table -5 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found -4 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +5 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables +4 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables execute stmt1 ; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 6 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table -5 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found -4 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +5 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables +4 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables explain SELECT (SELECT SUM(c1 + c12 + 0.0) FROM t2 where (t1.c2 - 0e-3) = t2.c2 GROUP BY t1.c15 LIMIT 1) as scalar_s, exists (select 1.0e+0 from t2 where t2.c3 * 9.0000000000 = t1.c4) as exists_s, c5 * 4 in (select c6 + 0.3e+1 from t2) as in_s, (c7 - 4, c8 - 4) in (select c9 + 4.0, c10 + 40e-1 from t2) as in_row_s FROM t1, (select c25 x, c32 y from t2) tt WHERE x * 1 = c25; id select_type table type possible_keys key key_len ref rows Extra 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 6 DERIVED NULL NULL NULL NULL NULL NULL NULL no matching row in const table -5 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found -4 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found +5 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables +4 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 2 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables deallocate prepare stmt1; |