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Bug #31145: ALTER TABLE DROP COLUMN, ADD COLUMN crashes (linux) or

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freezes (win) the server

The check for equality was assuming the field object is always 
created. If it's not it was de-referencing a NULL pointer.
Fixed to use the data in the create object instead.
This commit is contained in:
Georgi Kodinov
2009-12-18 14:00:30 +02:00
parent 479668498b
commit dbb7073c21
3 changed files with 20 additions and 2 deletions
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3
sql/field.cc
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@ -8282,8 +8282,7 @@ uint Field_blob::is_equal(Create_field *new_field)
return ((new_field->sql_type == get_blob_type_from_length(max_data_length()))
&& new_field->charset == field_charset &&
((Field_blob *)new_field->field)->max_data_length() ==
max_data_length());
new_field->pack_length == pack_length());
}