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Fix for bug #20204: "order by" changes the results returned

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Item_substr's results are improperly stored in a temporary table due to       
wrongly calculated max_length value for multi-byte charsets if two            
arguments specified.                                                          


mysql-test/r/ctype_utf8.result:
  Fix for bug #20204: "order by" changes the results returned
    - test case.
mysql-test/t/ctype_utf8.test:
  Fix for bug #20204: "order by" changes the results returned
    - test result.
sql/item_strfunc.cc:
  Fix for bug #20204: "order by" changes the results returned
    - always take into account current mbmaxlen value calculating max_length.
This commit is contained in:
unknown 2006-09-21 16:05:01 +05:00
commit 5d3a59fae7
3 changed files with 27 additions and 1 deletions
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3
sql/item_strfunc.cc
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@ -1109,12 +1109,13 @@ void Item_func_substr::fix_length_and_dec()
}
if (arg_count == 3 && args[2]->const_item())
{
int32 length= (int32) args[2]->val_int() * collation.collation->mbmaxlen;
int32 length= (int32) args[2]->val_int();
if (length <= 0)
max_length=0; /* purecov: inspected */
else
set_if_smaller(max_length,(uint) length);
}
max_length*= collation.collation->mbmaxlen;
}