diff options
Diffstat (limited to 'sql/sql_select.cc')
| -rw-r--r-- | sql/sql_select.cc | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/sql/sql_select.cc b/sql/sql_select.cc index 261a5c40c3b..49c0958055e 100644 --- a/sql/sql_select.cc +++ b/sql/sql_select.cc @@ -1667,8 +1667,11 @@ JOIN::exec() (zero_result_cause?zero_result_cause:"No tables used")); else { - result->send_fields(*columns_list, - Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF); + if (result->send_fields(*columns_list, + Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF)) + { + DBUG_VOID_RETURN; + } /* We have to test for 'conds' here as the WHERE may not be constant even if we don't have any tables for prepared statements or if @@ -2584,7 +2587,7 @@ make_join_statistics(JOIN *join, TABLE_LIST *tables, COND *conds, if (s->dependent & table->map) s->dependent |= table->reginfo.join_tab->dependent; } - if (s->dependent) + if (outer_join & s->table->map) s->table->maybe_null= 1; } /* Catch illegal cross references for outer joins */ @@ -13856,6 +13859,7 @@ join_init_cache(THD *thd,JOIN_TAB *tables,uint table_count) length=0; for (i=0 ; i < table_count ; i++) { + bool have_bit_fields= FALSE; uint null_fields=0,used_fields; Field **f_ptr,*field; MY_BITMAP *read_set= tables[i].table->read_set; @@ -13870,13 +13874,16 @@ join_init_cache(THD *thd,JOIN_TAB *tables,uint table_count) length+=field->fill_cache_field(copy); if (copy->blob_field) (*blob_ptr++)=copy; - if (field->maybe_null()) + if (field->real_maybe_null()) null_fields++; + if (field->type() == MYSQL_TYPE_BIT && + ((Field_bit*)field)->bit_len) + have_bit_fields= TRUE; copy++; } } /* Copy null bits from table */ - if (null_fields && tables[i].table->s->null_fields) + if (null_fields || have_bit_fields) { /* must copy null bits */ copy->str= tables[i].table->null_flags; copy->length= tables[i].table->s->null_bytes; |