diff options
Diffstat (limited to 'sql/log_event.cc')
| -rw-r--r-- | sql/log_event.cc | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/sql/log_event.cc b/sql/log_event.cc index 8f228232034..1f58c7ed1bf 100644 --- a/sql/log_event.cc +++ b/sql/log_event.cc @@ -1,5 +1,5 @@ /* - Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. + Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -8890,7 +8890,19 @@ static bool record_compare(TABLE *table) } } - if (table->s->blob_fields + table->s->varchar_fields == 0) + /** + Compare full record only if: + - there are no blob fields (otherwise we would also need + to compare blobs contents as well); + - there are no varchar fields (otherwise we would also need + to compare varchar contents as well); + - there are no null fields, otherwise NULLed fields + contents (i.e., the don't care bytes) may show arbitrary + values, depending on how each engine handles internally. + */ + if ((table->s->blob_fields + + table->s->varchar_fields + + table->s->null_fields) == 0) { result= cmp_record(table,record[1]); goto record_compare_exit; @@ -8905,13 +8917,22 @@ static bool record_compare(TABLE *table) goto record_compare_exit; } - /* Compare updated fields */ + /* Compare fields */ for (Field **ptr=table->field ; *ptr ; ptr++) { - if ((*ptr)->cmp_binary_offset(table->s->rec_buff_length)) + + /** + We only compare field contents that are not null. + NULL fields (i.e., their null bits) were compared + earlier. + */ + if (!(*(ptr))->is_null()) { - result= TRUE; - goto record_compare_exit; + if ((*ptr)->cmp_binary_offset(table->s->rec_buff_length)) + { + result= TRUE; + goto record_compare_exit; + } } } |