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Fixed a bug in key optimizing handling where the expression

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WHERE column_name = key_column_name was calculated as true
for NULL values.


Docs/manual.texi:
  Changelog
mysql-test/r/distinct.result:
  Updated results caused by bug fix.
mysql-test/r/null_key.result:
  New tests
mysql-test/t/null_key.test:
  New tests
sql/sql_select.cc:
  Additional change for previous changeset for using BLOB in GROUP BY
This commit is contained in:
unknown
2002-10-14 17:04:12 +03:00
parent 61632073ac
commit a86c172f58
6 changed files with 79 additions and 5 deletions
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18
sql/sql_select.cc
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@ -3319,7 +3319,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
char *tmpname,path[FN_REFLEN];
byte *pos,*group_buff;
uchar *null_flags;
Field **reg_field,**from_field;
Field **reg_field, **from_field, **blob_field;
Copy_field *copy=0;
KEY *keyinfo;
KEY_PART_INFO *key_part_info;
@ -3364,8 +3364,9 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
hidden_field_count=param->hidden_field_count;
if (!my_multi_malloc(MYF(MY_WME),
&table,sizeof(*table),
&reg_field,sizeof(Field*)*(field_count+1),
&from_field,sizeof(Field*)*field_count,
&reg_field, sizeof(Field*)*(field_count+1),
&blob_field, sizeof(Field*)*(field_count+1),
&from_field, sizeof(Field*)*field_count,
&copy_func,sizeof(*copy_func)*(param->func_count+1),
&param->keyinfo,sizeof(*param->keyinfo),
&key_part_info,
@ -3394,6 +3395,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
bzero((char*) reg_field,sizeof(Field*)*(field_count+1));
bzero((char*) from_field,sizeof(Field*)*field_count);
table->field=reg_field;
table->blob_field= (Field_blob**) blob_field;
table->real_name=table->path=tmpname;
/*
This must be "" as field may refer to it after tempory table is dropped
@ -3406,7 +3408,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
table->tmp_table= TMP_TABLE;
table->db_low_byte_first=1; // True for HEAP and MyISAM
table->temp_pool_slot = temp_pool_slot;
table->copy_blobs= 1;
/* Calculate which type of fields we will store in the temporary table */
@ -3450,7 +3452,10 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
if (!(new_field->flags & NOT_NULL_FLAG))
null_count++;
if (new_field->flags & BLOB_FLAG)
{
*blob_field++= new_field;
blob_count++;
}
((Item_sum*) item)->args[i]= new Item_field(new_field);
}
}
@ -3472,7 +3477,10 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
if (!(new_field->flags & NOT_NULL_FLAG))
null_count++;
if (new_field->flags & BLOB_FLAG)
{
*blob_field++= new_field;
blob_count++;
}
if (item->marker == 4 && item->maybe_null)
{
group_null_items++;
@ -3484,6 +3492,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
hidden_null_count=null_count;
}
field_count= (uint) (reg_field - table->field);
*blob_field= 0; // End marker
/* If result table is small; use a heap */
if (blob_count || using_unique_constraint || group_null_items ||
@ -3882,6 +3891,7 @@ free_tmp_table(THD *thd, TABLE *entry)
save_proc_info=thd->proc_info;
thd->proc_info="removing tmp table";
free_blobs(entry);
if (entry->db_stat && entry->file)
{
(void) entry->file->close();