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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 18:00:34 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 18:00:34 +0000
commit3f619478f796eddbba6e39502fe941b285dd97b1 (patch)
treee2c7b5777f728320e5b5542b6213fd3591ba51e2 /storage/myisammrg/myrg_rkey.c
parentInitial commit. (diff)
downloadmariadb-3f619478f796eddbba6e39502fe941b285dd97b1.tar.xz
mariadb-3f619478f796eddbba6e39502fe941b285dd97b1.zip
Adding upstream version 1:10.11.6.upstream/1%10.11.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'storage/myisammrg/myrg_rkey.c')
-rw-r--r--storage/myisammrg/myrg_rkey.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/storage/myisammrg/myrg_rkey.c b/storage/myisammrg/myrg_rkey.c
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+++ b/storage/myisammrg/myrg_rkey.c
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+/* Copyright (c) 2000-2003, 2005-2008 MySQL AB, 2009 Sun Microsystems, Inc.
+ Use is subject to license terms.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
+
+/* Read record based on a key */
+
+/*
+ * HA_READ_KEY_EXACT => SEARCH_BIGGER
+ * HA_READ_KEY_OR_NEXT => SEARCH_BIGGER
+ * HA_READ_AFTER_KEY => SEARCH_BIGGER
+ * HA_READ_PREFIX => SEARCH_BIGGER
+ * HA_READ_KEY_OR_PREV => SEARCH_SMALLER
+ * HA_READ_BEFORE_KEY => SEARCH_SMALLER
+ * HA_READ_PREFIX_LAST => SEARCH_SMALLER
+ */
+
+
+#include "myrg_def.h"
+
+/* todo: we could store some additional info to speedup lookups:
+ column (key, keyseg) can be constant per table
+ it can also be increasing (table1.val > table2.val > ...),
+ or decreasing, <=, >=, etc.
+ SerG
+*/
+
+int myrg_rkey(MYRG_INFO *info,uchar *buf,int inx, const uchar *key,
+ key_part_map keypart_map, enum ha_rkey_function search_flag)
+{
+ uchar *UNINIT_VAR(key_buff);
+ uint UNINIT_VAR(pack_key_length);
+ uint16 UNINIT_VAR(last_used_keyseg);
+ MYRG_TABLE *table;
+ MI_INFO *mi;
+ int err;
+ DBUG_ENTER("myrg_rkey");
+
+ if (_myrg_init_queue(info,inx,search_flag))
+ DBUG_RETURN(my_errno);
+
+ for (table=info->open_tables ; table != info->end_table ; table++)
+ {
+ mi=table->table;
+
+ if (table == info->open_tables)
+ {
+ err=mi_rkey(mi, 0, inx, key, keypart_map, search_flag);
+ /* Get the saved packed key and packed key length. */
+ key_buff=(uchar*) mi->lastkey+mi->s->base.max_key_length;
+ pack_key_length=mi->pack_key_length;
+ last_used_keyseg= mi->last_used_keyseg;
+ }
+ else
+ {
+ mi->once_flags|= USE_PACKED_KEYS;
+ mi->last_used_keyseg= last_used_keyseg;
+ err=mi_rkey(mi, 0, inx, key_buff, pack_key_length, search_flag);
+ }
+ info->last_used_table=table+1;
+
+ if (err)
+ {
+ if (err == HA_ERR_KEY_NOT_FOUND)
+ continue;
+ DBUG_PRINT("exit", ("err: %d", err));
+ DBUG_RETURN(err);
+ }
+ /* adding to queue */
+ queue_insert(&(info->by_key),(uchar *)table);
+
+ }
+
+ DBUG_PRINT("info", ("tables with matches: %u", info->by_key.elements));
+ if (!info->by_key.elements)
+ DBUG_RETURN(HA_ERR_KEY_NOT_FOUND);
+
+ mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
+ mi->once_flags|= RRND_PRESERVE_LASTINX;
+ DBUG_PRINT("info", ("using table no: %d",
+ (int) (info->current_table - info->open_tables + 1)));
+ DBUG_DUMP("result key", (uchar*) mi->lastkey, mi->lastkey_length);
+ DBUG_RETURN(_myrg_mi_read_record(mi,buf));
+}