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BUG#21902059: "CREATE TEMPORARY TABLE SELECT ..." AND BIT(1)

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COLUMNS

ANALYSIS:
=========
A valgrind error is reported when CREATE TABLE .. SELECT
involving BIT columns triggers a column type redefinition.

In general the pack_flag is set for BIT columns in
'mysql_prepare_create_table()'. However, during the above
operation, redefined column types was handled after the
special handling for BIT columns and thus pack_flag ended
up not being set correctly triggering the valgrind error.

FIX:
====
The patch fixes this problem by setting pack_flag correctly
for BIT columns in the case of column type redefinition.
This commit is contained in:
Karthik Kamath 2015-12-29 15:58:44 +05:30
parent 3c9ba967af
commit 1ec594dd60
1 changed files with 23 additions and 0 deletions
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23
sql/sql_table.cc
View File

@ -3081,8 +3081,31 @@ mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info,
else
{
/* Field redefined */
/*
If we are replacing a BIT field, revert the increment
of total_uneven_bit_length that was done above.
*/
if (sql_field->sql_type == MYSQL_TYPE_BIT &&
file->ha_table_flags() & HA_CAN_BIT_FIELD)
total_uneven_bit_length-= sql_field->length & 7;
sql_field->def= dup_field->def;
sql_field->sql_type= dup_field->sql_type;
/*
If we are replacing a field with a BIT field, we need
to initialize pack_flag. Note that we do not need to
increment total_uneven_bit_length here as this dup_field
has already been processed.
*/
if (sql_field->sql_type == MYSQL_TYPE_BIT)
{
sql_field->pack_flag= FIELDFLAG_NUMBER;
if (!(file->ha_table_flags() & HA_CAN_BIT_FIELD))
sql_field->pack_flag|= FIELDFLAG_TREAT_BIT_AS_CHAR;
}
sql_field->charset= (dup_field->charset ?
dup_field->charset :
create_info->default_table_charset);