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Made keyread (key scanning) a key specific attribute.

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This avoids using fulltext keys for table scanning.
This also reverts Sinisa's original fix for this problem.
This commit is contained in:
monty@hundin.mysql.fi
2002-06-19 00:22:30 +03:00
parent b1f7c1251c
commit 0d8e13979d
24 changed files with 1007 additions and 1120 deletions
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24
sql/opt_range.cc
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@ -682,27 +682,27 @@ int SQL_SELECT::test_quick_select(key_map keys_to_use, table_map prev_tables,
{
ha_rows found_records;
double found_read_time;
if (*key)
{
uint keynr= param.real_keynr[idx];
if ((*key)->type == SEL_ARG::MAYBE_KEY ||
(*key)->maybe_flag)
needed_reg|= (key_map) 1 << param.real_keynr[idx];
needed_reg|= (key_map) 1 << keynr;
found_records=check_quick_select(&param,idx, *key);
found_records=check_quick_select(&param, idx, *key);
if (found_records != HA_POS_ERROR && found_records > 2 &&
head->used_keys & ((table_map) 1 << param.real_keynr[idx]) &&
(head->file->table_flags() & HA_HAVE_KEY_READ_ONLY))
head->used_keys & ((table_map) 1 << keynr) &&
(head->file->index_flags(keynr) & HA_KEY_READ_ONLY))
{
/*
** We can resolve this by only reading through this key
** Assume that we will read trough the whole key range
** and that all key blocks are half full (normally things are
** much better)
We can resolve this by only reading through this key.
Assume that we will read trough the whole key range
and that all key blocks are half full (normally things are
much better).
*/
uint keys_per_block= head->file->block_size/2/
(head->key_info[param.real_keynr[idx]].key_length+
head->file->ref_length) + 1;
uint keys_per_block= (head->file->block_size/2/
(head->key_info[keynr].key_length+
head->file->ref_length) + 1);
found_read_time=((double) (found_records+keys_per_block-1)/
(double) keys_per_block);
}