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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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8
.bzrignore
View File

@ -505,3 +505,11 @@ vio/test-sslserver
vio/viotest-ssl
sql_error.cc
sql_prepare.cc
autom4te.cache/*
innobase/autom4te.cache/*
configure.lineno
innobase/configure.lineno
innobase/stamp-h1
myisam/rt_test.MYD
myisam/rt_test.MYI
stamp-h1

1
include/my_base.h
View File

@ -57,6 +57,7 @@ enum ha_rkey_function {
HA_READ_BEFORE_KEY, /* Find next rec. before key-record */
HA_READ_PREFIX, /* Key which as same prefix */
HA_READ_PREFIX_LAST, /* Last key with the same prefix */
HA_READ_PREFIX_LAST_OR_PREV, /* Last or prev key with the same prefix */
HA_READ_MBR_CONTAIN,
HA_READ_MBR_INTERSECT,
HA_READ_MBR_WITHIN,

2
myisam/mi_search.c
View File

@ -132,7 +132,7 @@ int _mi_search(register MI_INFO *info, register MI_KEYDEF *keyinfo,
if (_mi_get_prev_key(info,keyinfo, buff, info->lastkey, keypos,
&info->lastkey_length))
goto err;
if ((nextflag & SEARCH_LAST) &&
if (!(nextflag & SEARCH_SMALLER) &&
ha_key_cmp(keyinfo->seg, info->lastkey, key, key_len, SEARCH_FIND,
&not_used))
{

4
myisam/mi_static.c
View File

@ -51,12 +51,12 @@ uint NEAR myisam_read_vec[]=
{
SEARCH_FIND, SEARCH_FIND | SEARCH_BIGGER, SEARCH_FIND | SEARCH_SMALLER,
SEARCH_NO_FIND | SEARCH_BIGGER, SEARCH_NO_FIND | SEARCH_SMALLER,
SEARCH_FIND | SEARCH_PREFIX, SEARCH_LAST,
SEARCH_FIND | SEARCH_PREFIX, SEARCH_LAST, SEARCH_LAST | SEARCH_SMALLER,
MBR_CONTAIN, MBR_INTERSECT, MBR_WITHIN, MBR_DISJOINT, MBR_EQUAL
};
uint NEAR myisam_readnext_vec[]=
{
SEARCH_BIGGER, SEARCH_BIGGER, SEARCH_SMALLER, SEARCH_BIGGER, SEARCH_SMALLER,
SEARCH_BIGGER, SEARCH_SMALLER
SEARCH_BIGGER, SEARCH_SMALLER, SEARCH_SMALLER
};

10
sql/opt_range.cc
View File

@ -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)
{

2
sql/sql_handler.cc
View File

@ -88,7 +88,7 @@ int mysql_ha_close(THD *thd, TABLE_LIST *tables, bool dont_send_ok)
}
static enum enum_ha_read_modes rkey_to_rnext[]=
{ RNEXT, RNEXT, RPREV, RNEXT, RPREV, RNEXT, RPREV };
{ RNEXT, RNEXT, RPREV, RNEXT, RPREV, RNEXT, RPREV, RPREV };
int mysql_ha_read(THD *thd, TABLE_LIST *tables,