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Bug #43354: Use key hint can crash server in explain extended query

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The copy of the original arguments of a aggregate function was not
initialized until after fix_fields().
Sometimes (e.g. when there's an error processing the statement)
the print() can be called with no corresponding fix_fields() call.
      
Fixed by adding a check if the Item is fixed before using the arguments
copy.

mysql-test/r/explain.result:
  Bug #43354: test case
mysql-test/t/explain.test:
  Bug #43354: test case
sql/item_sum.cc:
  Bug #43354: use the argument list copy only if it's initialized
This commit is contained in:
Georgi Kodinov
2009-03-11 14:10:44 +02:00
parent 0614532a92
commit d3d6f4fdad
3 changed files with 19 additions and 1 deletions
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4
mysql-test/r/explain.result
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@@ -155,3 +155,7 @@ id select_type table type possible_keys key key_len ref rows Extra
Warnings:
Note 1003 select 1 AS `1` from (select count(distinct `test`.`t1`.`a`) AS `COUNT(DISTINCT t1.a)` from `test`.`t1` join `test`.`t2` group by `test`.`t1`.`a`) `s1`
DROP TABLE t1,t2;
CREATE TABLE t1 (a INT PRIMARY KEY);
EXPLAIN EXTENDED SELECT COUNT(a) FROM t1 USE KEY(a);
ERROR HY000: Key 'a' doesn't exist in table 't1'
DROP TABLE t1;