Fuzzer: Virtuoso 7.2.12 crashed at `dc_assign_copy`.
It can also be reproduced with Version 7.2.13-dev.3239-pthreads as of Mar 17 2024 (da40b02).

PoC:
```SQL
SELECT identity_generation x FROM information_schema . columns ORDER BY ( LENGTH ( id_to_iri ( RAND ( -17.400000 ) ) ) - CASE WHEN ( SELECT CASE WHEN x THEN 's' END ) THEN 1492 END );
```

backtrace:
```c
#0 0x88e527 (dc_assign_copy+0x697)
#1 0x829255 (select_node_input_subq_vec+0xfb5)
#2 0x7b912e (qn_input+0x3ce)
#3 0x7b912e (qn_input+0x3ce)
#4 0x7b9596 (qn_send_output+0x236)
#5 0x82bd7d (set_ctr_vec_input+0x99d)
#6 0x7b912e (qn_input+0x3ce)
#7 0x7594a8 (subq_next+0x258)
#8 0x82aa62 (ins_vec_subq+0x2a2)
#9 0x75b3db (code_vec_run_v+0x9bb)
#10 0x75cca6 (code_vec_run_v+0x2286)
#11 0x7b96de (qn_ts_send_output+0xbe)
#12 0x7bf16e (table_source_input+0x16ee)
#13 0x7b912e (qn_input+0x3ce)
#14 0x7b9596 (qn_send_output+0x236)
#15 0x7b912e (qn_input+0x3ce)
#16 0x7b9596 (qn_send_output+0x236)
#17 0x44c75e (chash_fill_input+0x13e)
#18 0x5375bf (hash_fill_node_input+0xef)
#19 0x7b912e (qn_input+0x3ce)
#20 0x7b9596 (qn_send_output+0x236)
#21 0x82bd7d (set_ctr_vec_input+0x99d)
#22 0x7b912e (qn_input+0x3ce)
#23 0x7ca91b (qr_exec+0x11db)
#24 0x7d82b6 (sf_sql_execute+0x11a6)
#25 0x7d8dbe (sf_sql_execute_w+0x17e)
#26 0x7e1a7d (sf_sql_execute_wrapper+0x3d)
#27 0xe2a11c (future_wrapper+0x3fc)
#28 0xe31a1e (_thread_boot+0x11e)
#29 0x7ffac49d8609 (start_thread+0xd9)
#30 0x7ffac47a8353 (clone+0x43)
```

ways to reproduce (write poc to the file /tmp/test.sql first):
```bash
# remove the old one
docker container rm virtdb_test -f
# start virtuoso through docker
docker run --name virtdb_test -itd --env DBA_PASSWORD=dba  pkleef/virtuoso-opensource-7
# wait the server starting
sleep 10
# check whether the simple query works
echo "SELECT 1;" | docker exec -i virtdb_test isql 1111 dba
# run the poc
cat /tmp/test.sql | docker exec -i virtdb_test isql 1111 dba
```
Fuzzer: Virtuoso 7.2.12 crashed at `dc_assign_copy`
This is a GitHub Issue
repo:virtuoso-opensource
owner:openlink
Title : Fuzzer: Virtuoso 7.2.12 crashed at `dc_assign_copy`
Issue date:

--- start body ---
Fuzzer: Virtuoso 7.2.12 crashed at `dc_assign_copy`.
It can also be reproduced with Version 7.2.13-dev.3239-pthreads as of Mar 17 2024 (da40b02).

PoC:
```SQL
SELECT identity_generation x FROM information_schema . columns ORDER BY ( LENGTH ( id_to_iri ( RAND ( -17.400000 ) ) ) - CASE WHEN ( SELECT CASE WHEN x THEN 's' END ) THEN 1492 END );
```

backtrace:
```c
#0 0x88e527 (dc_assign_copy+0x697)
#1 0x829255 (select_node_input_subq_vec+0xfb5)
#2 0x7b912e (qn_input+0x3ce)
#3 0x7b912e (qn_input+0x3ce)
#4 0x7b9596 (qn_send_output+0x236)
#5 0x82bd7d (set_ctr_vec_input+0x99d)
#6 0x7b912e (qn_input+0x3ce)
#7 0x7594a8 (subq_next+0x258)
#8 0x82aa62 (ins_vec_subq+0x2a2)
#9 0x75b3db (code_vec_run_v+0x9bb)
#10 0x75cca6 (code_vec_run_v+0x2286)
#11 0x7b96de (qn_ts_send_output+0xbe)
#12 0x7bf16e (table_source_input+0x16ee)
#13 0x7b912e (qn_input+0x3ce)
#14 0x7b9596 (qn_send_output+0x236)
#15 0x7b912e (qn_input+0x3ce)
#16 0x7b9596 (qn_send_output+0x236)
#17 0x44c75e (chash_fill_input+0x13e)
#18 0x5375bf (hash_fill_node_input+0xef)
#19 0x7b912e (qn_input+0x3ce)
#20 0x7b9596 (qn_send_output+0x236)
#21 0x82bd7d (set_ctr_vec_input+0x99d)
#22 0x7b912e (qn_input+0x3ce)
#23 0x7ca91b (qr_exec+0x11db)
#24 0x7d82b6 (sf_sql_execute+0x11a6)
#25 0x7d8dbe (sf_sql_execute_w+0x17e)
#26 0x7e1a7d (sf_sql_execute_wrapper+0x3d)
#27 0xe2a11c (future_wrapper+0x3fc)
#28 0xe31a1e (_thread_boot+0x11e)
#29 0x7ffac49d8609 (start_thread+0xd9)
#30 0x7ffac47a8353 (clone+0x43)
```

ways to reproduce (write poc to the file /tmp/test.sql first):
```bash
# remove the old one
docker container rm virtdb_test -f
# start virtuoso through docker
docker run --name virtdb_test -itd --env DBA_PASSWORD=dba  pkleef/virtuoso-opensource-7
# wait the server starting
sleep 10
# check whether the simple query works
echo "SELECT 1;" | docker exec -i virtdb_test isql 1111 dba
# run the poc
cat /tmp/test.sql | docker exec -i virtdb_test isql 1111 dba
```
--- end body ---
