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Better optimization for InnoDB and BDB tables for ORDER BY

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Build-tools/Do-compile:
  Merge with 4.0
Docs/manual.texi:
  Changelog
mysql-test/r/innodb.result:
  New tests cases for ORDER BY
mysql-test/r/myisam.result:
  New tests cases for ORDER BY
mysql-test/t/innodb.test:
  New tests cases for ORDER BY
mysql-test/t/myisam.test:
  New tests cases for ORDER BY
This commit is contained in:
unknown
2001-11-29 15:34:37 +02:00
parent 00d80ffff1
commit ace649189d
10 changed files with 143 additions and 7 deletions
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7
sql/sql_select.cc
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@ -5199,7 +5199,7 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit)
retrieving all rows through an index.
*/
if (select_limit >= table->file->records)
keys&= table->used_keys;
keys&= (table->used_keys | table->file->keys_to_use_for_scanning());
for (nr=0; keys ; keys>>=1, nr++)
{
@ -5213,6 +5213,11 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit)
join_init_read_last_with_key);
table->file->index_init(nr);
tab->type=JT_NEXT; // Read with index_first(), index_next()
if (table->used_keys & ((key_map) 1 << nr))
{
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
DBUG_RETURN(1);
}
}