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support for HA_READ_PREFIX_LAST_OR_PREV in headres

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full support for HA_READ_PREFIX_LAST_OR_PREV in MyISAM
protected by #if NOT_IMPLEMENTED_YET in opt_range.cc as not all table handlers support it


BitKeeper/etc/ignore:
  Added configure.lineno innobase/configure.lineno innobase/stamp-h1 myisam/rt_test.MYD myisam/rt_test.MYI stamp-h1 to the ignore list
include/my_base.h:
  support for HA_READ_PREFIX_LAST_OR_PREV
myisam/mi_search.c:
  full support of HA_READ_PREFIX_LAST_OR_PREV in MyISAM
myisam/mi_static.c:
  full support of HA_READ_PREFIX_LAST_OR_PREV in MyISAM
sql/opt_range.cc:
  support for HA_READ_PREFIX_LAST_OR_PREV
  protected by #if NOT_IMPLEMENTED_YET, not all table handlers support it
sql/sql_handler.cc:
  support for HA_READ_PREFIX_LAST_OR_PREV
This commit is contained in:
unknown
2002-10-25 14:09:47 +00:00
parent 372b26e778
commit 14e6526a0b
6 changed files with 35 additions and 18 deletions
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12
sql/opt_range.cc
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@ -2238,7 +2238,7 @@ check_quick_keys(PARAM *param,uint idx,SEL_ARG *key_tree,
{
tmp=param->table->file->
records_in_range((int) keynr,(byte*)(param->min_key + 1),
min_key_length, (ha_rkey_function)(tmp_min_flag ^ GEOM_FLAG),
min_key_length, (ha_rkey_function)(tmp_min_flag ^ GEOM_FLAG),
(byte *)NullS,0,HA_READ_KEY_EXACT);
}
else
@ -2705,20 +2705,28 @@ int QUICK_SELECT_DESC::get_next()
}
else
{
DBUG_ASSERT(range->flag & NEAR_MAX || range_reads_after_key(range));
#if NOT_IMPLEMENTED_YET
result=file->index_read(record, (byte*) range->max_key,
range->max_length,
((range->flag & NEAR_MAX) ?
HA_READ_BEFORE_KEY : HA_READ_PREFIX_LAST_OR_PREV));
#else
/* Heikki changed Sept 11, 2002: since InnoDB does not store the cursor
position if READ_KEY_EXACT is used to a primary key with all
key columns specified, we must use below HA_READ_KEY_OR_NEXT,
so that InnoDB stores the cursor position and is able to move
the cursor one step backward after the search. */
DBUG_ASSERT(range->flag & NEAR_MAX || range_reads_after_key(range));
/* Note: even if max_key is only a prefix, HA_READ_AFTER_KEY will
* do the right thing - go past all keys which match the prefix */
result=file->index_read(record, (byte*) range->max_key,
range->max_length,
((range->flag & NEAR_MAX) ?
HA_READ_KEY_OR_NEXT : HA_READ_AFTER_KEY));
result = file->index_prev(record);
#endif
}
if (result)
{