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Bug#47669 Query showed by EXPLAIN EXTENDED gives different result from original query

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Item_field::print method does not take into
account fields whose values may be null.
The fix is to print 'NULL' if field value is null.


mysql-test/r/explain.result:
  test case
mysql-test/r/func_str.result:
  result fix
mysql-test/r/having.result:
  result fix
mysql-test/r/select.result:
  result fix
mysql-test/r/subselect.result:
  result fix
mysql-test/r/union.result:
  result fix
mysql-test/t/explain.test:
  test case
sql/item.cc:
  print 'NULL' if field value is null.
This commit is contained in:
Sergey Glukhov 2010-02-26 17:40:01 +04:00
commit ca6691533a
8 changed files with 48 additions and 16 deletions
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2
mysql-test/r/having.result
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@ -12,7 +12,7 @@ explain extended select count(a) as b from t1 where a=0 having b >=0;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
Warnings:
Note 1003 select count('0') AS `b` from `test`.`t1` where 0 having (`b` >= 0)
Note 1003 select count(NULL) AS `b` from `test`.`t1` where 0 having (`b` >= 0)
drop table t1;
CREATE TABLE t1 (
raw_id int(10) NOT NULL default '0',