MDEV-36205 coverage test

Author: vuvova

mysql-test/main/vector_subdist.result

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+#
+# MDEV-36205 subdist optimization
+#
+create table t1 (
+id int unsigned auto_increment primary key,
+v vector(500) not null,
+vector index(v)
+);
+set rand_seed1=1234567890, rand_seed2=3;
+insert t1 (v) select vec_fromtext(json_arrayagg(rand() order by rand())) from seq_1_to_500 veclen, seq_1_to_200 numvecs group by numvecs.seq;
+drop table t1;
+# End of 12.1 tests

mysql-test/main/vector_subdist.test

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+source include/have_sequence.inc;
+
+--echo #
+--echo # MDEV-36205 subdist optimization
+--echo #
+# for now it'll just provide code coverage
+# after MDEV-34805 it'll show the stats too
+create table t1 (
+  id int unsigned auto_increment primary key,
+  v vector(500) not null,
+  vector index(v)
+);
+
+set rand_seed1=1234567890, rand_seed2=3;
+insert t1 (v) select vec_fromtext(json_arrayagg(rand() order by rand())) from seq_1_to_500 veclen, seq_1_to_200 numvecs group by numvecs.seq;
+drop table t1;
+
+--echo # End of 12.1 tests