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ORDER BY optimization

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Fixed new bug when reading field types


client/mysql.cc:
  Fixed output for -T
libmysql/libmysql.c:
  Filled missing fields in new MYSQL_FIELD structure
  Fixed new bug when reading field types
mysql-test/r/order_by.result:
  Result after new order by optimization
sql/opt_range.cc:
  New ORDER BY optimization
sql/opt_range.h:
  New ORDER BY optimization
sql/set_var.cc:
  Speed optimization
sql/sql_select.cc:
  New ORDER BY optimization
  
  This alllows MySQL to change a ref/range index from (a,b) to (a,c) when 'b' was not used to find rows and one did
  ORDER BY a,c or ORDER BY c
This commit is contained in:
unknown
2003-05-27 18:40:37 +03:00
parent 1540912eca
commit ef6d3a8060
7 changed files with 40 additions and 20 deletions
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6
libmysql/libmysql.c
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@ -1207,6 +1207,10 @@ unpack_fields(MYSQL_DATA *data,MEM_ROOT *alloc,uint fields,
field->length= (uint) uint3korr(row->data[2]);
field->type= (enum enum_field_types) (uchar) row->data[3][0];
field->catalog=(char*) "";
field->db= (char*) "";
field->catalog_length= 0;
field->db_length= 0;
field->org_table_length= field->table_length= lengths[0];
field->name_length= lengths[1];
@ -2883,7 +2887,7 @@ get_info:
mysql->extra_info= net_field_length_ll(&pos); /* Maybe number of rec */
if (!(fields=read_rows(mysql,(MYSQL_FIELD*)0, protocol_41(mysql) ? 6 : 5)))
if (!(fields=read_rows(mysql,(MYSQL_FIELD*)0, protocol_41(mysql) ? 7 : 5)))
DBUG_RETURN(1);
if (!(mysql->fields=unpack_fields(fields,&mysql->field_alloc,
(uint) field_count,0,