MDEV-35922 Server crashes in mhnsw_read_first upon using vector key with views

Author: vuvova

mysql-test/main/vector_innodb.result

@@ -273,4 +273,16 @@ drop table t;
 create table t (v vector (1) not null,vector index (v)) engine=innodb;
 ERROR 42000: This table type requires a primary key
 set global innodb_force_primary_key=0;
+#
+# MDEV-35922 Server crashes in mhnsw_read_first upon using vector key with views
+#
+create table t (pk int primary key, v vector(1) not null, vector(v)) engine=innodb;
+insert into t values (1,0x31313131),(2,0x32323232);
+create view v as select * from t;
+select pk from v order by vec_distance_euclidean(v, 0x30303030) limit 2;
+pk
+1
+2
+drop view v;
+drop table t;
 # End of 11.7 tests

mysql-test/main/vector_innodb.test

@@ -274,4 +274,15 @@ drop table t;
 --error ER_REQUIRES_PRIMARY_KEY
 create table t (v vector (1) not null,vector index (v)) engine=innodb;
 set global innodb_force_primary_key=0;
+
+--echo #
+--echo # MDEV-35922 Server crashes in mhnsw_read_first upon using vector key with views
+--echo #
+create table t (pk int primary key, v vector(1) not null, vector(v)) engine=innodb;
+insert into t values (1,0x31313131),(2,0x32323232);
+create view v as select * from t;
+select pk from v order by vec_distance_euclidean(v, 0x30303030) limit 2;
+drop view v;
+drop table t;
+
 --echo # End of 11.7 tests

sql/item_vectorfunc.h

@@ -49,9 +49,9 @@ class Item_func_vec_distance_common: public Item_real_func
   double val_real() override;
   Item *get_const_arg() const
   {
-    if (args[0]->type() == Item::FIELD_ITEM && args[1]->const_item())
+    if (args[0]->real_item()->type() == Item::FIELD_ITEM && args[1]->const_item())
       return args[1];
-    if (args[1]->type() == Item::FIELD_ITEM && args[0]->const_item())
+    if (args[1]->real_item()->type() == Item::FIELD_ITEM && args[0]->const_item())
       return args[0];
     return NULL;
   }