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initial support for vector indexes

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MDEV-33407 Parser support for vector indexes

The syntax is

  create table t1 (... vector index (v) ...);

limitation:
* v is a binary string and NOT NULL
* only one vector index per table
* temporary tables are not supported

MDEV-33404 Engine-independent indexes: subtable method

added support for so-called "high level indexes", they are not visible
to the storage engine, implemented on the sql level. For every such
an index in a table, say, t1, the server implicitly creates a second
table named, like, t1#i#05 (where "05" is the index number in t1).
This table has a fixed structure, no frm, not accessible directly,
doesn't go into the table cache, needs no MDLs.

MDEV-33406 basic optimizer support for k-NN searches

for a query like SELECT ... ORDER BY func() optimizer will use
item_func->part_of_sortkey() to decide what keys can be used
to resolve ORDER BY.
This commit is contained in:
Sergei Golubchik 2024-01-17 15:32:45 +01:00
commit d6add9a03d
28 changed files with 888 additions and 89 deletions
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13
sql/item_vectorfunc.cc
View file

@ -24,6 +24,19 @@
#include <my_global.h>
#include "item.h"
key_map Item_func_vec_distance::part_of_sortkey() const
{
key_map map(0);
if (Item_field *item= get_field_arg())
{
Field *f= item->field;
for (uint i= f->table->s->keys; i < f->table->s->total_keys; i++)
if (f->table->s->key_info[i].algorithm == HA_KEY_ALG_VECTOR &&
f->key_start.is_set(i))
map.set_bit(i);
}
return map;
}
double Item_func_vec_distance::val_real()
{