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Merge maint2.mysql.com:/data/localhome/tsmith/bk/mrg50/50

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into  maint2.mysql.com:/data/localhome/tsmith/bk/mrg50/51
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tsmith@maint2.mysql.com
2006-09-13 09:03:52 +02:00
parent a1c4a48b7e e38f04a09f
commit 6a31ec2cad
39 changed files with 612 additions and 341 deletions
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21
sql/sql_select.cc
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@ -9094,11 +9094,6 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
keyinfo->key_length+= key_part_info->length;
}
}
else
{
set_if_smaller(table->s->max_rows, rows_limit);
param->end_write_records= rows_limit;
}
if (distinct && field_count != param->hidden_field_count)
{
@ -9113,8 +9108,6 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
null_pack_length-=hidden_null_pack_length;
keyinfo->key_parts= ((field_count-param->hidden_field_count)+
test(null_pack_length));
set_if_smaller(share->max_rows, rows_limit);
param->end_write_records= rows_limit;
table->distinct= 1;
share->keys= 1;
if (blob_count)
@ -9169,6 +9162,20 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
0 : FIELDFLAG_BINARY;
}
}
/*
Push the LIMIT clause to the temporary table creation, so that we
materialize only up to 'rows_limit' records instead of all result records.
This optimization is not applicable when there is GROUP BY or there is
no GROUP BY, but there are aggregate functions, because both must be
computed for all result rows.
*/
if (!group && !thd->lex->current_select->with_sum_func)
{
set_if_smaller(table->s->max_rows, rows_limit);
param->end_write_records= rows_limit;
}
if (thd->is_fatal_error) // If end of memory
goto err; /* purecov: inspected */
share->db_record_offset= 1;