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row0sel.c:

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Fix bug number 154: GROUP BY and DISTINCT could treat NULL values inequal
This commit is contained in:
heikki@hundin.mysql.fi 2003-03-15 20:05:03 +02:00
parent efbb9d45c1
commit c4370278a0
1 changed files with 7 additions and 12 deletions
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19
innobase/row/row0sel.c
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@ -2130,19 +2130,14 @@ row_sel_store_mysql_rec(
extern_field_heap = NULL;
}
} else {
/* MySQL sometimes seems to copy the 'data'
pointed to by a BLOB field even if the field
has been marked to contain the SQL NULL value.
This caused seg faults reported by two users.
Set the BLOB length to 0 and the data pointer
to NULL to avoid a seg fault. */
/* MySQL seems to assume the field for an SQL NULL
value is set to zero. Not taking this into account
caused seg faults with NULL BLOB fields, and
bug number 154 in the MySQL bug database: GROUP BY
and DISTINCT could treat NULL values inequal. */
if (templ->type == DATA_BLOB) {
row_sel_field_store_in_mysql_format(
mysql_rec + templ->mysql_col_offset,
templ->mysql_col_len, NULL,
0, templ->type, templ->is_unsigned);
}
memset(mysql_rec + templ->mysql_col_offset, '\0',
templ->mysql_col_len);
if (!templ->mysql_null_bit_mask) {
fprintf(stderr,